Moyer v. United Dominion Industries, Inc. ( 2007 )


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  •                                                                                                                            Opinions of the United
    2007 Decisions                                                                                                             States Court of Appeals
    for the Third Circuit
    1-9-2007
    Moyer v. United Dominion Ind
    Precedential or Non-Precedential: Precedential
    Docket No. 04-2104
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    PRECEDENTIAL
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    No. 04-2104
    DONALD E. MOYER; JAYNE L. MOYER; KAREN L.
    WEIDNER; MICHAEL T. WILLIAMS; REBECCA
    WILLIAMS; THOMAS C. SECHRIST; PATRICIA D.
    SECHRIST; STEVE R. KERN; BONNIE KERN, DAVID P.
    WEIDNER
    v.
    UNITED DOMINION INDUSTRIES, INC.,
    Appellant
    On Appeal from the United States District Court
    for the Eastern District of Pennsylvania
    (D.C. No. 97-cv-5569)
    District Judge: Honorable Petrese B. Tucker
    Submitted pursuant to Third Circuit LAR 34.1(1)
    June 20, 2006*
    Before: FUENTES, CHAGARES, and ROTH,** Circuit Judges.
    *
    This case was initially argued before the panel of Judges
    Roth, Fuentes and Becker on November 14, 2005. After Judge
    Becker died on May 10, 2006, Judge Chagares was added to the
    panel.
    **
    Judge Roth assumed senior status May 31, 2006.
    (Filed: January 9, 2007)
    Lauren R. Goldman (Argued)
    Andrew L. Frey
    Evan A. Creutz
    Mayer, Brown, Rowe & Mawe, LLP
    1675 Broadway
    New York, NY 10019
    Attorneys for Appellant
    Rosemary Pinto (Argued)
    Christopher D. Warren
    Feldman & Pinto PC
    1604 Locust Street, 2R
    Philadelphia, PA 19103
    Attorneys for Appellees
    OPINION OF THE COURT
    FUENTES, Circuit Judge.
    Plaintiffs are five factory workers who allege serious and
    permanent hand injuries after years of using defendant’s swager, a
    machine used to form metal. Plaintiffs claim that the swager was
    defectively designed because it emitted excessive vibration, and
    that the defendant failed to warn them of the vibration risk.
    Before trial, and in accordance with Pennsylvania law, the
    District Court conducted a risk-utility analysis and determined, as
    a threshold matter, that the swager was “unreasonably dangerous.”
    After a two-week jury trial on the design defect and failure to warn
    claims, a jury awarded plaintiffs and their wives approximately
    $13.5 million. On appeal, we consider several evidentiary issues,
    as well as whether plaintiffs’ claims are barred by the applicable
    2
    statute of limitations. For the reasons that follow, we will affirm
    in part, reverse in part, and remand for further proceedings.
    I. Background
    Plaintiff-Appellees Donald Moyer, David Weidner, Michael
    Williams, Thomas Sechrist, and Steve Kern are employees of
    Brush Wellman, a company that manufactures beryllium copper
    alloys.1 Defendant-Appellant United Dominion Industries, Inc.
    (“UNI”) controls Fenn Manufacturing Corporation (“Fenn”), which
    produced the swager at issue in this litigation and sold it to Brush
    Wellman in 1983.2 Brush Wellman installed the Fenn swager in its
    rod and wire department as a component of a bull block, a
    collection of machinery that operates to reduce the diameter of
    beryllium copper wire. As part of this process, metal coils are fed
    into a swager, which shapes the end of the coil into a point.
    Plaintiffs claim that vibrations generated by the Fenn swager
    caused them to develop Hand-Arm Vibration Syndrome
    (“HAVS”), a dysfunction that can lead to severe pain, numbness,
    and motor difficulties in the operator’s hands and arms. Plaintiffs
    state that they experience near-constant pain and that they have
    difficulty performing ordinary activities such as driving a car,
    mowing the lawn, and playing sports with their children. The
    workers’ wives state that their husbands’ moods and temperaments
    have worsened since the injuries. Each plaintiff continues to work
    at Brush Wellman.
    In 1994, some bull block operators complained of hand
    problems attributed to the Fenn swager. Brush Wellman hired
    WorkAbility, an ergonomic consulting firm, to look into the
    1
    The wives of these employees—Jayne Moyer, Karen
    Weidner, Rebecca Williams, Patricia Sechrist, and Bonnie Kern,
    respectively—are also plaintiffs in this case. For convenience,
    references to “plaintiffs” in this opinion refer only to the Brush
    Wellman employee plaintiffs unless otherwise indicated.
    2
    Both parties refer to defendant as “Fenn” and we will
    follow this convention for the remainder of this opinion.
    3
    complaints. Following a January 1995 visit to Brush Wellman,
    Jeffrey Eckel, a WorkAbility representative, sent a letter to Brush
    Wellman offering various suggestions. At trial, Eckel testified that
    his letter suggested that operators use anti-vibration gloves and
    perform certain hand and wrist exercises, and that Brush Wellman
    rotate duties among employees and distribute discomfort surveys
    to operators. Eckel also testified that the letter attributed a “fair
    amount of vibration” to the swager but it noted that the amount of
    time each worker spent at the swager was minimal. In June 1995,
    Brush Wellman formed a committee to consider replacing the Fenn
    swager with a new model. In 1996, the company purchased a new
    model along with an optional feature sold separately: an automatic
    feed that eliminates exposure of the swager operator to the
    machine’s vibration. Brush Wellman paid approximately $27,000
    for the swager and $9,200 for the automatic feed.
    In 1997, plaintiffs filed a strict liability action in the U.S.
    District Court for the Eastern District of Pennsylvania, alleging (1)
    that the Fenn swager was defectively designed because it did not
    have an automatic feed, and (2) that Fenn had a duty to provide
    adequate warnings about the vibrations generated by the Fenn
    swager and did not do so. The wives of the factory workers
    claimed loss of consortium. Following trial, the jury awarded
    $2,450,000 to Donald Moyer; $2,800,000 to Steve Kern;
    $1,600,000 to Thomas Sechrist; $3,400,000 to Michael Williams;
    $2,700,000 to David Weidner; and $100,000 to each employee’s
    wife. Fenn then moved for judgment as a matter of law or, in the
    alternative, for a new trial, and plaintiffs sought delay damages
    under Rule 238 of the Pennsylvania Rules of Civil Procedure.3 The
    3
    Rule 238 provides for an award of delay damages against
    any defendant found liable to the plaintiff in a civil action seeking
    monetary relief for bodily injury, death, or property damage. Pa.
    R. Civ. P. 238 (a)(1). With certain exceptions, see Pa. R. Civ. P.
    238(b)(1), delay damages are to be awarded “for the period of time
    from a date one year after the date original process was first served
    in the action up to the date of the award, verdict or decision.” Pa.
    R. Civ. P. 238(a)(2).
    4
    District Court denied Fenn’s motions and awarded plaintiffs a total
    of $3,242,566 in delay damages.
    On appeal, Fenn argues that the District Court erred by (1)
    making the “unreasonably dangerous” determination under an
    incorrect standard; (2) excluding evidence of misuse and improper
    maintenance of the swager by plaintiffs and by Brush Wellman; (3)
    excluding evidence of the lack of previous claims against Fenn for
    injuries caused by swager vibration; (4) excluding vibration
    exposure guidelines proffered by Fenn; (5) excluding evidence
    about foreseeability in relation to plaintiffs’ failure-to-warn claim;
    (6) improperly instructing the jury; (7) failing to bar the claims of
    plaintiffs Moyer, Sechrist, and Kern under Pennsylvania’s two-year
    statute of limitations for personal injury claims; (8) failing to find
    the damages awarded by the jury to be grossly excessive; and (9)
    awarding delay damages and excessive post-judgment interest to
    the plaintiffs. Fenn asserts that, based on all the relevant evidence,
    it is entitled to judgment as a matter of law on all claims. In the
    alternative, Fenn argues that in light of the District Court’s various
    errors, a new trial is necessary.
    II. Discussion
    A.     “Unreasonably Dangerous” Analysis
    Under Pennsylvania law, strict liability allows recovery
    when a defective product that is “unreasonably dangerous” causes
    harm to a user or consumer. See Phillips v. A-Best Prod. Co., 
    665 A.2d 1167
    , 1170 (Pa. 1995) (quoting Restatement (Second) of
    Torts § 402A). Yet, in Azzarello v. Black Bros. Co., 
    391 A.2d 1020
    , 1026 (Pa. 1978), the Pennsylvania Supreme Court rejected
    the use of the “unreasonably dangerous” formulation as part of the
    jury instructions in products liability cases. In Azzarello, the Court
    was concerned that, although a jury is obviously competent to
    resolve disputes about the condition of a product, whether that
    condition justifies placing liability upon the supplier presents an
    entirely different question. 
    Id. Because the
    Supreme Court
    believed the “unreasonably dangerous” decision to be a question of
    law, the resolution of which depends upon social policy
    considerations, it concluded that the judge must make that decision.
    5
    In Surace v. Caterpillar, Inc., 
    111 F.3d 1039
    (3d Cir. 1997),
    we considered how the trial judge should make the threshold
    unreasonably dangerous determination. Applying Pennsylvania
    law, we held that the judge should “engage in a risk-utility
    analysis, weighing a product’s harms against its social utility.” 
    Id. at 1044.
    We identified some of the factors relevant to this analysis:
    (1) The usefulness and desirability of the
    product—its utility to the user and to the public as a
    whole; (2) The safety aspects of the product—the
    likelihood that it will cause injury, and the probable
    seriousness of the injury; (3) The availability of a
    substitute product which would meet the same need
    and not be as unsafe; (4) The manufacturer’s ability
    to eliminate the unsafe character of the product
    without impairing its usefulness or making it too
    expensive to maintain its utility; (5) The user’s
    ability to avoid danger by the exercise of care in the
    use of the product; (6) The user’s anticipated
    awareness of the dangers inherent in the product and
    their avoidability, because of general public
    knowledge of the obvious condition of the product,
    or of the existence of suitable warnings or
    instruction; and (7) The feasibility, on the part of the
    manufacturer, of spreading the loss of [sic] setting
    the price of the product or carrying liability
    insurance.
    
    Id. at 1046
    (quoting Dambacher v. Mallis, 
    485 A.2d 408
    , 423 n.5
    (Pa. Super. Ct. 1984). Relying on these factors, the judge makes
    the pre-trial determination as a matter of law. 
    Id. (explaining that
    determination of “whether the product’s condition justifies placing
    the risk of loss on the manufacturer or supplier” is a question of
    law for the judge); see also A-Best Prod. 
    Co., 665 A.2d at 1171
    n.5; 
    Azzarello, 391 A.2d at 1026
    . Furthermore, the judge makes
    the determination under a weighted view of the evidence,
    considering the facts in the light most favorable to the plaintiff.
    See A-Best Prod. Co., 
    665 A.2d 1171
    n.5.
    If the judge concludes that a product is “unreasonably
    dangerous” the case is submitted to the jury, which then decides,
    6
    based on all the evidence presented, “whether the facts of the case
    support the averments of the complaint.” 
    Azzarello, 391 A.2d at 1026
    . In making this determination, however, the jury does not
    balance the risk-utility factors, even though the judge has only
    done so as a threshold matter. See, e.g., Brandimarti v. Caterpillar
    Tractor Co., 
    527 A.2d 134
    , 138 (Pa. Super. Ct. 1987) (holding that
    the jury is not to be presented with risk-utility factors); Restatement
    (Third) of Torts: Products Liability § 2, Reporters’ Note, cmt. d, at
    55 (1998) (noting that in Pennsylvania “the court has reserved to
    itself risk-utility balancing . . . .”); James Henderson, Jr. & Aaron
    D. Twerski, Achieving Consensus on Defective Product Design, 83
    Cornell L. Rev. 867, 897 (1998) (“Pennsylvania stands alone in its
    view that risk-utility balancing is never properly a jury function.”).
    Instead, the jury considers whether the product “‘left the supplier’s
    control lacking any element necessary to make it safe for its
    intended use or possessing any feature that renders it unsafe for the
    intended use.’” Phillips v. Cricket Lighters, 
    841 A.2d 1000
    , 1005
    (Pa. 2003) (quoting 
    Azzarello, 391 A.2d at 1027
    ) (emphasis
    omitted).
    The Pennsylvania Supreme Court intends that this division
    of labor between judge and jury will preserve the substantive
    distinction between strict liability and negligence causes of action.
    See Lewis v. Coffing Hoist Div., Duff-Norton Co., 
    528 A.2d 590
    ,
    593 (Pa. 1987) (emphasizing Azzarello’s conclusion that
    “negligence concepts have no place in a case based on strict
    liability”); Cricket 
    Lighters, 841 A.2d at 1007
    (“Strict liability was
    intended to be a cause of action separate and distinct from
    negligence, designed to fill a perceived gap in our tort law.”). The
    Court has explained that the jury’s focus should be on the condition
    of the product, not on the conduct of the supplier. See 
    Lewis, 528 A.2d at 593
    (“[I]t is the product itself which is on trial, and not the
    manufacturer’s conduct.”).
    The two-step process adopted in Azzarello is not without
    controversy. Soon after the case was decided, one commentator
    noted that Azzarello’s limitation of the jury’s role was “a matter of
    concern since the jury has traditionally played an important role in
    the expansion of the law of products liability.” Aaron D. Twerski,
    From Risk-Utility to Consumer Expectation: Enhancing the Role
    of Judicial Screening in Product Liability Litigation, 11 Hofstra L.
    7
    Rev. 861, 926 (1983). Another writer more recently noted that
    “Azzarello remains to this day one of the most controversial
    opinions ever issued on the subject of strict products liability for
    alleged design defects.” John M. Thomas, Defining “Design
    Defect” in Pennsylvania: Reconciling Azzarello and the
    Restatement (Third) of Torts, 71 Temp. L. Rev. 217, 217 (1998).
    Furthermore, the latest Restatement of Torts has called
    Pennsylvania’s products liability law “sometimes difficult to
    decipher.” See Restatement (Third) of Torts: Products Liability §
    2, Reporters’ Note, cmt. d, at 54. Even a member of
    Pennsylvania’s Supreme Court recently criticized Azzarello’s
    controversial approach. See Cricket 
    Lighters, 841 A.2d at 1016
    (Saylor, J., concurring) (“There are several ambiguities and
    inconsistencies in Pennsylvania’s procedure . . . which render our
    law idiosyncratic.”).
    Our own review of products liability law reveals that most
    other jurisdictions give the jury a central role in making the strict
    liability determination and regard juries as capable of balancing
    risk-utility factors, even though some of those factors may touch on
    matters of social policy.4 Indeed, our research fails to disclose any
    4
    See, e.g., Alabama: Graham v. Sprout-Waldron & Co., 
    657 So. 2d 868
    , 870-71, 874 (Ala. 1995) (jury application of consumer
    expectations test); Alaska: Gen. Motors Corp. v. Farnsworth, 
    965 P.2d 1209
    , 1220-21 (Alaska 1998) (jury application of either
    consumer expectations test or risk-utility test, depending on the
    circumstances); Arizona: Dart v. Wiebe Mfg., Inc., 
    709 P.2d 876
    ,
    880 (Ariz. 1985) (jury application of either consumer expectations
    or risk-utility test); Arkansas: Farm Bureau Ins. Co. v. Case Corp.,
    
    878 S.W.2d 741
    , 744-45 & n.4 (Ark. 1994) (jury application of
    consumer expectations test); California: Soule v. Gen. Motors
    Corp., 
    882 P.2d 298
    , 308-10 (Cal. 1994) (jury application of
    consumer expectations test incorporating some risk-utility factors);
    Colorado: Barton v. Adams Rental, Inc., 
    938 P.2d 532
    , 537 (Colo.
    1997) (jury application of risk-utility test); Connecticut: Potter v.
    Chicago Pneumatic Tool Co., 
    694 A.2d 1319
    , 1333-34 & n.15
    (Conn. 1997) (jury application of consumer expectations test
    incorporating risk-utility factors); Florida: Standard Jury
    Instructions-Civil Cases (99-1) 
    778 So. 2d 264
    , 271 (Fla. 2000)
    8
    (standard strict products liability jury instructions provide for use
    of both consumer expectations and risk-utility test); Georgia:
    Banks v. ICI Americas, Inc., 
    450 S.E.2d 671
    , 673-75 (Ga. 1994)
    (jury application of risk-utility analysis with a consideration of
    whether there is a reasonable alternative design); Hawaii: Ontai v.
    Straub Clinic & Hosp., Inc., 
    659 P.2d 734
    , 739-42 (Haw. 1983)
    (jury application of consumer expectations or risk-utility test);
    Idaho: Rojas v. Lindsay Mfg. Co., 
    701 P.2d 210
    , 211-12 (Idaho
    1985) (jury application of consumer expectations test); Illinois:
    Hansen v. Baxter Healthcare Corp., 
    764 N.E.2d 35
    , 43-46 (Ill.
    2002) (jury application of both consumer expectations and risk-
    utility test, along with consideration of whether there is reasonable
    alternative design); Indiana: Welch v. Scripto-Tokai Corp., 
    651 N.E.2d 810
    , 814 & n.2 (Ind. Ct. App. 1995) (jury application of
    consumer expectations test); Iowa: Wright v. Brooke Group Ltd.,
    
    652 N.W.2d 159
    , 169 (Iowa 2002) (jury application of risk-utility
    analysis with requirement that plaintiff demonstrate safer
    alternative design); Kansas: Delaney v. Deere & Co., 
    999 P.2d 930
    ,
    944-46 (Kan. 2000) (jury application of consumer expectations
    test); Kentucky: Ostendorf v. Clark Equip. Co., 
    122 S.W.3d 530
    ,
    535 (Ky. 2003) (jury application of risk-utility analysis); Maryland:
    Murphy v. Playtex Family Prod. Corp., 
    176 F. Supp. 2d 473
    , 485,
    489-90 (D. Md. 2001) (jury application of either consumer
    expectations or risk-utility test); Mississippi: Smith v. Mack
    Trucks, Inc., 
    819 So. 2d 1258
    , 1266 (Miss. 2002) (jury application
    of risk-utility analysis); New Hampshire: Vautour v. Body Masters
    Sports Indus., Inc., 
    784 A.2d 1178
    , 1182 (N.H. 2001) (jury
    application of combined consumer expectations and risk-utility
    tests); New Jersey: Lewis v. Am. Cyanamid Co., 
    715 A.2d 967
    ,
    975 (N.J. 1998) (jury application of risk-utility analysis; plaintiff
    must demonstrate feasible alternative design); New Mexico:
    Brooks v. Beech Aircraft Corp., 
    902 P.2d 54
    , 61-62 (N.M. 1995)
    (jury application of risk-utility analysis); New York: Denny v. Ford
    Motor Co., 
    662 N.E.2d 730
    , 735-38 (N.Y. 1995) (jury application
    of risk-utility analysis); Ohio: Conde v. Velsicol Chem. Corp., 
    804 F. Supp. 972
    , 978, 982 (S.D. Ohio 1992) (jury application of either
    consumer expectations or risk-utility test); Oklahoma: Basford v.
    Gray Mfg. Co., 
    11 P.3d 1281
    , 1284 (Okla. Civ. App. 2000) (jury
    question whether product was “unreasonably dangerous”); Oregon:
    9
    other jurisdiction that has adopted the two-step approach or denies
    the jury a chance to apply the risk-utility test. Nevertheless, the
    Azzarello framework represents the Pennsylvania Supreme Court’s
    decision about the proper adjudication of the substantive rights of
    litigants in the products liability context, and, as a federal court
    sitting in diversity, “we are bound to adjudicate the case in
    accordance with applicable state law.” Nationwide Mut. Ins. Co.
    v. Cosenza, 
    258 F.3d 197
    , 202 (3d Cir. 2001).5
    McCathern v. Toyota Motor Corp., 
    985 P.2d 804
    , 809-11, 814-15
    (Or. Ct. App. 1999) (jury application of consumer expectations test,
    with some use of risk-utility analysis); South Carolina: Reed v.
    Tiffin Motor Homes, Inc., 
    697 F.2d 1192
    , 1195-97 (4th Cir. 1982)
    (applying South Carolina law) (jury application of mix of consumer
    expectations and risk-utility analysis); Tennessee: Jackson v. Gen.
    Motors Corp., 
    60 S.W.3d 800
    , 803-05 (Tenn. 2001) (jury
    application of either consumer expectations test or variation of the
    risk-utility test); Texas: Hernandez v. Tokai Corp., 
    2 S.W.3d 251
    ,
    256 & n.8 (Tex. 1999) (jury application of risk-utility analysis;
    plaintiff must also show evidence of safer alternative design);
    Wisconsin: Green v. Smith & Nephew AHP, Inc., 
    629 N.W.2d 727
    ,
    738-41 (Wis. 2001) (jury application of consumer expectations
    test). Cf. Missouri: Rodriguez v. Suzuki Motor Corp., 
    996 S.W.2d 47
    , 65 (Mo. 1999) (rejection of both consumer expectations and
    risk-utility tests; whether product is unreasonably dangerous is “an
    ultimate issue for the jury,” to be determined without “external
    standards”); Wyoming: Campbell ex rel. Campbell v. Studer, Inc.,
    
    970 P.2d 389
    , 392-93 (Wyo. 1998) (jury determination of whether
    product is unreasonably dangerous without clearly articulated test).
    5
    Perhaps Pennsylvania’s unique two-step process has
    contributed to the challenges we have met to the relevance and
    admissibility of evidence in suits arising under the state’s strict
    liability law. See, e.g., Forrest v. Beloit Corp., 
    424 F.3d 344
    , 353-
    62 (3d Cir. 2005) (addressing admissibility of evidence in
    Pennsylvania products liability case); Barker v. Deere & Co., 
    60 F.3d 158
    , 161-64 (3d Cir. 1995) (same); Habecker v. Clark Equip.
    Co., 
    36 F.3d 278
    , 284-87 (3d Cir. 1994) (same); Dillinger v.
    Caterpillar, Inc., 
    959 F.2d 430
    , 435-44 (3d Cir. 1992) (same).
    10
    B.     Exclusion of Evidence
    Against this backdrop, the District Court in this case
    engaged in a threshold risk-utility analysis on a weighted view of
    the evidence before proceeding to trial. See Moyer v. United
    Dominion Indus., Inc., No. 97-CV-5569, 
    2004 WL 764841
    , at *11-
    12 (E.D. Pa. Mar. 31, 2004). Fenn argues that this risk-utility
    analysis should have been performed under a neutral view of the
    evidence. This contention, however, is foreclosed by Third Circuit
    and Pennsylvania precedent. More persuasively, Fenn asserts that,
    based on a misunderstanding of Pennsylvania law, the District
    Court erroneously excluded evidence pertinent to the jury’s
    ultimate defective design determination.
    Fenn also contends that the District Court erred in excluding
    from the jury’s consideration all evidence relating to “conduct,”
    including evidence of misuse and evidence concerning the lack of
    prior claims. The District Court did not provide reasons for its
    evidentiary exclusions in its pre-trial order, but indicated in its
    post-trial denial of Fenn’s motions that its evidentiary exclusions
    were based, at least in part, on its interpretation of Azzarello. For
    example, the District Court explicitly distinguished between the
    role of the Court in performing the risk-utility analysis and the
    evidence presented at trial, citing at length portions of Azzarello
    relating to the respective roles of judge and jury. Moyer, 
    2004 WL 764842
    , at *14-15. Because we believe that the District
    Court’s understanding of Azzarello ultimately affected its
    evidentiary rulings, we briefly review what evidence a jury can
    consider in a strict liability case under Azzarello. We then turn to
    the District Court’s exclusion of certain evidence that we believe
    warrants remand for a new trial.
    As discussed, Azzarello reserves a screening function for
    the judge who makes the “unreasonably dangerous” determination
    before the jury considers the case. If the judge concludes that the
    product is unreasonably dangerous under the facts as alleged by the
    plaintiff, the jury makes factual determinations regarding liability.
    Specifically, the jury is required, under Azzarello, to consider
    whether a product “lack[s] any element necessary to make it safe
    for its intended use.” 
    Azzarello, 391 A.2d at 1027
    . We do not
    believe that, under this approach, the Pennsylvania Supreme Court
    11
    expects that a judge will prevent all evidence considered in the
    risk-utility analysis from reaching the jury. Nor do we believe that,
    when the Azzarello Court adopted its own strict liability standard,
    it intended to deprive the jury of its significant fact-finding
    responsibilities. Indeed, comparing the “intended use” standard
    with the risk-utility standard, we observe that evidence pertinent to
    one will often be relevant to the other.
    For one thing, just as the judge has considered “safety”
    under the second risk-utility factor, the jury will also have to
    consider evidence relevant to whether the product is “safe.” See
    
    Azzarello, 391 A.2d at 1027
    (laying out jury standard that product
    must be “safe for its intended use”) (emphasis added). Moreover,
    just as the judge has evaluated feasible alternatives to a product
    under the fourth risk-utility factor, the jury will also have to
    evaluate them to assess the “condition” of a product. See 
    Surace, 111 F.3d at 1049
    (“[T]he technical feasibility issue will go to the
    jury in determining whether the [proposed safety feature] was an
    element necessary to make the [product] safe for its intended
    use.”). And, as discussed below, to assess other factual issues,
    such as causation or lack of defect, the jury will have to consider
    evidence relied on by the judge. In other words, evidence should
    not be excluded from the jury simply because it was relevant to the
    judge’s threshold risk-utility analysis.          Such a relevance
    determination must be made on its own merits, even though the
    jury’s consideration of this evidence provides the defendant an
    opportunity to contest certain facts relevant to the judge’s analysis.
    1.      Evidence of Misuse and Inadequate
    Maintenance
    Fenn argues that the District Court erred in excluding
    evidence that plaintiffs and Brush Wellman misused and
    inadequately maintained the swager, as well as evidence that this
    conduct, rather than the alleged design defect, led to plaintiffs’
    injuries. Plaintiffs argue that the evidence was irrelevant because
    Fenn failed to demonstrate that misuse or improper maintenance
    actually caused plaintiffs’ injuries. The District Court excluded the
    proffered evidence without explanation.
    A ruling on the admissibility of evidence is reviewed for
    12
    abuse of discretion. 
    Forrest, 424 F.3d at 349
    . To demonstrate an
    abuse of discretion, Fenn must show that the District Court’s
    decision was “arbitrary, fanciful or clearly unreasonable.” Stecyk
    v. Bell Helicopter Textron, Inc., 
    295 F.3d 408
    , 412 (3d Cir. 2002)
    (internal quotation marks omitted). Of course, only relevant
    evidence is admissible at trial. Fed. R. Evid. 402. But relevant
    evidence is defined broadly as evidence that has “any tendency to
    make the existence of any fact that is of consequence to the
    determination of the action more probable or less probable than it
    would be without the evidence.” Fed. R. Evid. 401. Here, Fenn
    argues that evidence of misuse is relevant to negating causation, a
    necessary element of plaintiffs’ design defect claim.
    Under Pennsylvania law, evidence of misuse is generally
    admissible to defeat causation in a strict liability design defect case.
    See 
    Dillinger 959 F.2d at 445
    (noting that “[t]he Pennsylvania
    courts . . . appear to permit the defendant to introduce evidence
    establishing that the plaintiff misused the product to defeat a
    products liability claim”); Clark v. Bil-Jax, Inc., 
    763 A.2d 920
    , 923
    (Pa. Super. Ct. 2000) (“[E]vidence of a plaintiff’s . . . misuse of a
    product . . . is admissible [in a strict liability action] insofar as it
    relates to the element of causation.”) (internal quotations marks
    omitted); Charlton v. Toyota Indus. Equip., 
    714 A.2d 1043
    , 1047
    (Pa. Super. Ct. 1998) (same). Some Pennsylvania cases suggest,
    however, that such evidence is admissible only if the misuse was
    the sole cause of the injury. See Madonna v. Harley Davidson,
    Inc., 
    708 A.2d 507
    , 509 (Pa. Super. Ct. 1998) (“As [several
    Pennsylvania] cases demonstrate, a user’s negligence is not
    relevant if the product defect contributed in any way to the harm.
    However, where the defense offers evidence to establish that the
    accident was solely the result of the user’s conduct, and not related
    in any way with a product defect, it is relevant and admissible for
    the purpose of proving causation.”).
    Thus, Fenn’s evidence should have been admitted if it had
    any tendency to show that plaintiffs’ injuries were caused solely by
    misuse and inadequate maintenance of the swager, rather than by
    a design defect. Fenn asserts that it proffered significant evidence
    suggesting misuse and inadequate maintenance by Brush Wellman.
    Brush Wellman’s maintenance manager, David Graeff, testified at
    his deposition that the swager was overused and that the dies,
    13
    which are components of the swager that assist in the metal shaping
    process, would become “red hot smoking.” (Joint Appendix (“JA”)
    1426.) He further testified that “in most cases the operators
    probably didn’t do the normal daily things to the swager—I know
    they didn’t— . . . that we later found out we were supposed to be
    doing. And that means such things as cleaning out the shavings out
    of the dies and hammers that accumulated.” (JA 1426.) Graeff
    also stated:
    [A]t times I remember the flakes would build up so
    bad that the hammers would lock up, and we would
    get work orders like, the swager doesn’t work. Well,
    it’s like, Duh, open the door up and look at the
    machine and see what’s going on, and you’ll realize
    that you should be—you know, like it’s locked up
    because there’s so much residue in here that it can’t
    run.
    (JA 1428.)
    In addition, Graeff testified that the operators would
    improperly use the swager to process oversized metal. Walter
    Perun, Fenn’s manufacturing manager, inspected the Brush
    Wellman swager in 1995. He testified at his deposition that
    operators of the swager were using manila tags under the dies to
    compress the dies and achieve a certain diameter, and that this was
    an improper use of the machine. He also stated that “[c]omponents
    within the machine were quite worn,” “their setup [of the machine
    was] definitely improper,” and “[t]he machine was very loaded
    with chips and it is not a chip cutting machine; it’s a swaging
    machine.” (JA 1434.)
    Lastly, a “Memorandum of Justification” prepared by Brush
    Wellman staff to support their request for a new swager noted that
    in 1994, several bull block operators had hand and wrist symptoms
    that they attributed to vibration caused by swaging and that an
    investigation indicated that:
    1. The operators are handling additional coils of
    larger diameter material requiring a higher frequency
    of swaging larger material
    14
    2. The large diameter material is approaching
    approximately 5/8" or larger which is outside the
    operational limits of the existing Fenn swager
    ...
    4. The swager no longer operates in the manner
    designed by the manufacturer
    5. The swager is not hammering the material
    properly as [chips], [f]lakes and dust are evident in
    and around the machine
    (JA 1422 (emphasis added).) The memo also noted that, after an
    investigation of the swager by a Fenn representative,
    [t]he representative indicated that due to heavy use,
    age and lack of routine maintenance, the inner
    workings of the swager are out of tolerance and
    need machining. These inner workings, are causing
    employees to be over-exposed to the excessive
    vibration. During his visit, the representative also
    determined that some diameters of metal processed
    . . . exceed the operational limits of the swager
    which may result in excessive vibration and
    accelerated wear of the machinery.
    (JA 1423 (emphasis added.))
    Regarding causation, Fenn argues that several portions of
    deposition testimony indicated that misuse or lack of maintenance
    of the swager could lead to a dangerous increase in vibrations.
    Walter Perun suggested such a connection in his deposition:
    Q: What would the result of the chipping problem
    be? What would be the problems when you have that
    chipping? What occurs?
    A (Walter Perun): These chips may get caught in
    between the components of the machine creating a
    larger interference than the machine is designed to
    handle causing premature hardening and pitting of
    those components, which in turn hardened
    components that pit from within the head can also
    damage other components within the machine
    15
    because they will float around as the machine is
    rotating.
    ...
    Q: Does it affect the user in any way?
    A: It can.
    Q: How?
    A. If the [swager] isn’t running properly it would be
    hard to feed. They would have to push a lot harder to
    get it in. If it’s not shimmed properly—the machine
    is designed to operate on a center line and if they are
    not shimming properly, they are offsetting the center
    line which causes the machine to run in an out of
    round condition.
    Q: What is an out of round condition? What does that
    mean?
    ...
    A: Not concentric.
    Q: Okay. Does that create any safety hazard for the
    worker, the user of the machine?
    A: It may.
    Q: In what way?
    A: Depending on to what extent. If they were to be
    shimmed 70 thousandths off of center line, then it
    can cause vibration.
    Q: The same question with regard to the other
    problems that we talked about, I think you talked
    about parts of the machine being improperly
    maintained and not—not cleaned and not properly
    maintained. Could that affect vibration levels?
    A: It may.
    (JA 1438.) David Graeff appeared to share this view. In his
    deposition, he was asked: “Did anybody from Fenn, to your
    recollection, ever tell you that improper maintenance could cause
    personal injury due to an increase in vibration?” He replied: “I
    don’t remember that being said, but it’s pretty apparent that, yes,
    that is the case.” (JA 1431.)6
    6
    Fenn also argues that the trial and deposition testimony of
    its expert, Dr. Cherniack, supports its causation argument. At trial,
    16
    This Court has noted that “[t]he definition of relevant
    evidence is very broad” and that Rule 401 “does not raise a high
    standard.” Gibson v. Mayor & Council of Wilmington, 
    355 F.3d 215
    , 232 (3d Cir. 2004) (internal quotations marks omitted).
    “[W]hile Rule 401 gives judges great freedom to admit evidence,
    [it] diminishes substantially their authority to exclude evidence as
    irrelevant.” 
    Id. (internal quotation
    marks omitted) (alteration in
    original). In this case, we hold that the evidence proffered by the
    defendant had the tendency to demonstrate an alternative cause for
    plaintiffs’ development of HAVS, and was relevant under Rule
    401. We therefore conclude that the District Court abused its
    discretion in excluding the evidence.
    Plaintiffs suggest that even if the District Court erred, the
    error was harmless because Fenn was permitted to introduce
    evidence of misuse and improper maintenance at trial despite the
    District Court’s pre-trial ruling. An error is harmless “only if it is
    highly probable that the error did not affect the outcome of the
    case.” 
    Forrest, 424 F.3d at 349
    (internal quotation marks omitted).
    Plaintiffs note that, at trial, plaintiffs’ expert witness, Dr. David
    Clark, agreed on cross-examination that “[m]aintenance is a
    consideration” in controlling hazards. (JA 270.) Dr. Clark also
    admitted that he did not investigate Brush Wellman’s maintenance
    of the swager in reaching the conclusion that the swager caused
    plaintiffs’ injuries. Plaintiffs also point to Walter Perun’s trial
    testimony that, based on his inspection of the Fenn swager in 1995,
    it was not “operating as designed.” (JA 503.) In addition, plaintiffs
    note that Mr. Moyer and Mr. Sechrist admitted at trial that they
    would sometimes swage one coil several times, and that they would
    swage very large coils by forcing them into the machine. Other
    trial testimony suggested that these were improper uses of the
    swager, as a particular coil should not be swaged more than once
    and some of the swaged coils were larger than intended for the
    Dr. Cherniack suggested that improper balance within machines
    generally can increase vibration, but he did not provide clear
    testimony about the swager in particular. Dr. Cherniack’s
    deposition testimony was similarly vague. Overall, Dr. Cherniack’s
    testimony only minimally strengthens Fenn’s causation argument.
    17
    Fenn swager.7
    Although Fenn managed to introduce some testimony related
    to maintenance and misuse at trial, we cannot say that the District
    Court’s pre-trial order did not affect the verdict. The statements in
    the Memorandum of Justification provide more explicit evidence of
    misuse and lack of maintenance than any evidence admitted at trial.
    Moreover, defense counsel was constrained by the District Court’s
    pre-trial ruling from conducting extensive cross-examination on the
    issue and including a detailed discussion in the opening and closing
    statements. A party is severely impaired when it is prohibited from
    presenting its theory of a case in a comprehensive and organized
    manner at trial, even if it has managed to slip a few references into
    the record. We hold that the District Court’s exclusion of Fenn’s
    evidence of misuse and inadequate maintenance was not harmless
    error.8
    7
    It is notable that, in considering plaintiffs’ motion for a
    new trial or for judgment as a matter of law based on the exclusion
    of evidence of misuse, the District Court did not attempt to justify
    its decision to exclude the evidence. Instead, the District Court
    found any error to be harmless because “[w]hile the Court did not
    permit the Defendant to offer evidence to the extent requested, this
    Court did not totally exclude the evidence on issues of misuse,
    failure to maintain, and changes in the swaging machine.” Moyer,
    
    2004 WL 764841
    , at *8.
    8
    Fenn argues that, based on the evidence of misuse and
    improper maintenance, the District Court should have granted
    Fenn’s motion for judgment as a matter of law as to plaintiffs’
    design defect claim. We exercise plenary review over the District
    Court’s denial and apply the same standard as the District Court.
    Lightning Lube, Inc. v. Witco Corp., 
    4 F.3d 1153
    , 1166 (3d Cir.
    1993). “Such a motion should be granted only if, viewing the
    evidence in the light most favorable to the nonmovant and giving
    it the advantage of every fair and reasonable inference, there is
    insufficient evidence from which a jury reasonably could find
    liability.” 
    Id. We hold
    that judgment as a matter of law was not
    warranted here. A jury reasonably could find that any misuse and
    improper maintenance of the Fenn swager was not sufficient to
    18
    2.     Evidence of Existence of Prior Claims
    Fenn also appeals the District Court’s exclusion of evidence
    concerning the lack of prior claims against Fenn for vibration-
    related hand injuries. Fenn would have presented testimony
    describing the absence of such claims in UNI’s computerized
    database of claims and lawsuits. The District Court excluded the
    evidence without explanation.
    Whether evidence of a lack of prior claims is admissible in
    a diversity case is governed by federal law. See 
    Forrest, 424 F.3d at 354
    . In Forrest, this Court noted that evidence of a lack of past
    claims in a products liability case may suggest lack of product
    defect, lack of an unduly dangerous situation, or lack of causation,
    and is thus generally relevant under the Federal Rules of Evidence.
    
    Id. at 356.
    The Forrest Court emphasized, however, that such
    evidence should often be excluded under Rule 403, if the probative
    value of the evidence is substantially outweighed by its prejudicial
    effect or its tendency to confuse or mislead the jury. 
    Id. at 356.
    The Court noted that evidence of no past claims, “by its very
    nature, raises significant concerns regarding unfair prejudice to the
    plaintiff,” and that the danger of prejudice is particularly strong
    under Pennsylvania law, which requires the jury to focus solely on
    “whether the product as designed presents a potential danger to the
    intended user,” and leaves risk-utility analysis to the judge. 
    Id. at 357-58.
    Rule 403 analysis of past claims evidence necessarily
    “turns on the facts and circumstances of each case.” 
    Id. at 358.
    The Forrest Court suggested a three-part analysis for determining
    whether past claims should be admitted:
    (a) similarity—the defendant must show that the
    proffered testimony relates to substantially identical
    products used in similar circumstances; (b)
    breadth— the defendant must provide the court with
    information concerning the number of prior units
    cause plaintiffs’ alleged injuries, and that the cause of plaintiffs’
    injuries was the Fenn swager as originally designed and sold to
    Brush Wellman. For similar reasons, judgment as a matter of law
    was also unwarranted for plaintiffs’ failure to warn claim.
    19
    sold and the extent of prior use; and (c)
    awareness—the defendant must show that it would
    likely have known of prior accidents had they
    occurred.
    
    Id. at 358.
    Under the test set forth in Forrest, the District Court should
    not have excluded Fenn’s proffered evidence. Kathleen DeLoache,
    UNI’s litigation paralegal, testified in her deposition that since the
    mid-1980’s, UNI has maintained a comprehensive computerized
    database of claims and lawsuits filed against UNI and its
    subsidiaries. DeLoache stated that she performed a search of the
    database and found no evidence of any claim or lawsuit, prior to
    this litigation, based on an allegation of upper-extremity injury due
    to vibration caused by a Fenn swager or by any other UNI product.
    In addition, John Bryzgel, who had previously worked as vice
    president of the machinery division at Fenn, testified at trial that
    Fenn has produced and sold thousands of swagers since 1950, and
    that less than 5% of the large model swagers have been sold with
    automatic feeds. Although plaintiffs argue that Fenn’s proffered
    evidence was not specific to the model 3F 2 swager—the type of
    swager sold to Brush Wellman—plaintiffs never challenged the
    evidence on this ground, and Bryzgel did testify that all Fenn 3F
    swaging machines are “basically the same as far as all the internal
    parts go.” (JA 537.) Accordingly, the evidence proffered by Fenn
    was sufficient to satisfy the similarity, breadth, and awareness
    requirements described in Forrest.9 We therefore conclude that the
    District Court improperly excluded the evidence.
    C.      Statute of Limitations
    9
    Under the awareness prong, plaintiffs argue that HAVS is
    a “latent dose-response creeping disease,” and that incorrect
    diagnosis or a long-term failure to recognize the problem could
    have resulted in a lack of claims recorded by Fenn. In light of the
    long period during which Fenn has recorded claims, however, it is
    reasonable to assume that, if there had been HAVS-related swager
    allegations, Fenn would have been aware of at least some of them.
    Plaintiffs have presented no evidence to contradict this view.
    20
    We also consider Fenn’s contention that the claims of
    plaintiffs Moyer, Sechrist, and Kern are barred by Pennsylvania’s
    two-year statute of limitations for personal injury suits. 42 Pa.
    Cons. Stat. Ann. § 5524(2).10 Fenn filed for summary judgment on
    this issue before trial and its motion was denied. Moyer v. United
    Dominion Indus., Inc., No. 97-CV-5569, 
    1999 WL 391488
    , at * 3
    (E.D. Pa. May 25, 1999). The District Court submitted the issue to
    the jury in a special interrogatory, and the jury found that the statute
    of limitations did not bar the claims of any plaintiff. See Moyer,
    
    2004 WL 764841
    , at *3.11
    We look to Pennsylvania tolling principles in applying the
    state’s limitations period. Bohus v. Beloff, 
    950 F.2d 919
    , 924 (3d
    Cir. 1991). We exercise plenary review over the District Court’s
    decision to submit the limitations issue to the jury, as well as its
    interpretation of applicable tolling principles, but we review for
    clear error all factual findings underlying the District Court’s
    analysis of the tolling issue. See Sheet Metal Workers Int’l Ass’n,
    Local 19 v. 2300 Group, Inc., 
    949 F.2d 1274
    , 1278 (3d Cir. 1991).
    Plaintiffs’ complaint was filed on September 2, 1997. Thus,
    the limitations period must have been triggered no earlier than
    September 2, 1995, for each plaintiff to satisfy Pennsylvania’s
    statute. Generally, the statute of limitations for a tort action under
    Pennsylvania law begins to accrue when the injury is sustained.
    Debiec v. Cabot Corp., 
    352 F.3d 117
    , 128-29 (3d Cir. 2003). The
    “discovery rule” is an exception to this principle, which applies
    where “a party, through no fault of his or her own, does not
    discover [his or] her injury until after the statute of limitations
    normally would have run.” 
    Id. at 129.
    In that case, the limitations
    period begins to run when “the plaintiff knows, or reasonably
    should know: (1) that he has been injured, and (2) that his injury
    10
    The statute provides that “[a]n action to recover damages
    for injuries to the person or for the death of an individual caused by
    the wrongful act or neglect or unlawful violence or negligence of
    another” must be commenced within two years.
    11
    On appeal, Fenn does not assert that the claims of
    Williams or Weidner are time-barred.
    21
    has been caused by another party’s conduct.” 
    Id. (internal quotation
    marks omitted). The party claiming the benefit of the
    discovery rule has the burden of demonstrating that it applies, and
    must establish reasonable diligence in investigating his or her
    physical condition, with “reasonableness” considered under an
    objective standard. 
    Id. Thus, in
    latent disease cases, the limitations
    period is triggered when “the plaintiffs possessed ‘sufficient critical
    facts to put [them] on notice that a wrong has been committed and
    that [they] need investigate to determine whether [they were]
    entitled to redress.’” 
    Id. (quoting Zeleznik
    v. United States, 
    770 F.2d 20
    , 23 (3d Cir. 1985)) (alterations in original). The issue of
    reasonable diligence is usually for the jury to decide, but “where
    the facts are so clear that reasonable minds cannot differ, the
    commencement period may be determined as a matter of law.”
    Cochran v. GAF Corp., 
    666 A.2d 245
    , 248 (Pa. 1995).
    1.     Donald Moyer
    Moyer testified that he has worked at Brush Wellman since
    1990, and that the job has always involved some level of hand pain.
    In November 1995, Moyer’s hands turned white and numb while he
    was hunting, and became very painful after the numbness abated.
    This condition, which was different from hand pain that he had
    previously experienced, occurred several times after the hunting
    incident and prompted him to visit a company doctor, Dr. Grundy,
    in January 1996. Dr. Grundy told him that he had hereditary
    Raynaud’s disease. After reading an article about Raynaud’s and
    vibration in March 1996, Moyer went to see an expert, who told
    him that his hand problems were probably due to the swager.
    Moyer testified that prior to 1996, he was not told by anyone that
    vibration from the swager could cause him injury.
    Fenn notes that “a definitive diagnosis of an injury is not
    necessary to start the statute running,” 
    Debiec, 352 F.3d at 132
    , and
    argues that Moyer knew about a connection between his hand pain
    and the swager in April 1995. In that month, Moyer filled out a
    WorkAbility discomfort survey in which he noted that he
    experienced discomfort in his “shoulder, elbow, forearm, fingers,
    and upper back,” and that his symptoms included “aching and
    numbness, tingling, burning, and stiffness.” (JA 118-19.) In
    response to the survey question “what do you think caused the
    22
    problem?” Moyer wrote “[the bull block], the swager, and working
    with heavy wire.” (JA 119.) Asked to comment on “what you
    think would decrease your problems,” Moyer wrote: “Replace
    swager with one suited for the job. Rotate with other operators.
    Have production control try to even out the heavy work between
    the three shifts.” (JA 119-20.)
    Fenn also notes that Jeffrey Eckel, the WorkAbility
    employee who visited Brush Wellman in early 1995 to investigate
    complaints of hand problems, testified that workers suggested to
    him during the visit that their problems might be caused by the
    swager. Eckel also testified, however, that he did not tell any
    workers at the company that they had sustained an injury or had a
    vibration-related disease.
    We conclude that Moyer’s claim is not time-barred. While
    it is clear from Moyer’s survey responses that by April 1995 he
    suspected that the swager, among other machinery, was causing
    him hand discomfort, it cannot be said as a matter of law that he
    knew or should have known that he had suffered an injury. Moyer
    testified that the problems in his hands changed significantly in
    character in November 1995, from the general type of hand aches
    and pains that he was familiar with to whiteness, numbness, and
    pain that did not dissipate for a long period of time. The jury could
    have reasonably concluded that until this new pain arose, Moyer
    had no reason to suspect wrongdoing or to investigate his condition.
    We therefore decline to dismiss Moyer’s claim on statute of
    limitations grounds.
    2.     Steve Kern
    Kern stated at trial that he has worked at Brush Wellman
    since 1978, and first experienced problems with his hands in 1993.
    During a hunting trip that year, his hands turned white and became
    numb. Before that time, he had experienced “a normal tiredness
    and fatigue and aching” in his hands. (JA 168.) He did not see a
    doctor about the white hands occurrence, but mentioned it during
    a routine physical exam with a nurse at Brush Wellman in October
    of 1993. Kern testified that the nurse “just kind of—she might have
    said something. I don’t know. But it was like no big deal. And we
    just proceeded with the exam.” (JA 170.) He stated that the nurse
    23
    did not tell him that the hand problem might have any connection
    to his work, and did not send him to see a doctor. The nurse’s
    report from that appointment was submitted into evidence. As read
    by the nurse at trial, the report included the following notations:
    Notice midring, little fingers . . . both hands white,
    blanched numb—unable to straighten. Went home
    and was unable to straighten digits until he ran warm
    H20 [sic] across inner wrist areas. Eventually
    circulation restored and feeling returned.
    Raynaud’s[?] Told him he should get it evaluated. .
    . . Also told Hank Arbo, plant manager, possibility
    of work-related cause. Does do job involving
    vibration.
    (JA 209.) At trial, the nurse did not remember specifically what she
    told Kern at the appointment.
    Kern testified that his hands turned white a few times when
    he was swimming during the summer of 1994, and also during the
    hunting season in 1994. It never occurred while he was at work,
    however, and he associated the problem with cold rather than with
    work-related activities. Kern testified that at his company physical
    in 1994, he mentioned the problem again and the nurse “really
    didn’t think much of it and just proceeded with the examination.”
    (JA 172.) Early in 1996, he first suspected that his hand problem
    might be work-related after he discussed the issue with Moyer. In
    May 1996, Dr. Grundy told him that he had Raynaud’s disease
    caused by vibration from the swager.
    We reject Fenn’s assertion that Kern’s claim is time-barred
    as a matter of law. The nurse’s testimony was not definitive, and
    a question of material fact was presented as to whether Kern
    possessed sufficient information prior to 1996 to put him on notice
    that a wrong may have been committed against him. The District
    Court properly concluded that the statute of limitations issue should
    be sent to the jury.
    3.      Thomas Sechrist
    Sechrist testified that in 1992, he fractured his left wrist and
    24
    hurt his right hand and shoulder in a fall. Following this accident,
    he began to experience weakness in his right hand that he described
    to several doctors, who told him that the problem was due to old
    age and the fall. In July 1993, he saw Dr. Holm, who wrote in his
    notes that Sechrist had “numbness in his right hand, especially in
    the lateral three fingers. He feels his right hand grasp may be
    diminished.” (JA 148.) He began to experience white fingers when
    he was cold. He continued to see doctors about the hand problems
    in 1994 and 1995, and the doctors “kept blaming it on being an old
    person.” (JA 135.) In 1996, Dr. Grundy told Sechrist that he had
    Raynaud’s disease caused by vibration from the swager.
    Fenn argues that Sechrist’s position on a Brush Wellman
    committee organized in June 1995 to purchase a new swager shows
    that he was (or should have been) aware of an injury because the
    committee knew of workers’ hand complaints and the possible role
    of the swager. Sechrist disputed this view at trial, testifying that the
    committee only “looked at a new swager. We were just looking for
    a new swager.” (JA 157.) The “Memorandum of Justification”
    prepared by the committee states that:
    In December 1994, the Reading Plant received word
    from corporate medical staff that several bull block
    operators had symptoms in their hands and wrists
    that were indicative of cumulative trauma/repetitive
    motion related injuries. . . . Operators attributed these
    symptoms to vibration caused by swaging operations.
    (JA 1421.) The report went on to state that:
    The Rod & Wire Team established a committee to
    develop, review and evaluate potential solutions to
    this safety problem. The committee met several times
    and discussed many possible scenarios. The solution
    determined to be most feasible and limit injury to
    employees is to purchase and install a new swaging
    machine . . . .
    (JA 1423.)
    Although the committee report indicates that Sechrist was
    25
    aware of a connection between the Fenn swager and employee hand
    problems in June 1995, we conclude that a question of fact
    remained for the jury as to whether Sechrist knew or should have
    known at the time that his hand injuries were caused by the swager.
    According to his own testimony, Sechrist did not know until 1996
    that his injury was caused by the swager, since his doctors had
    repeatedly attributed his hand problems to old age. This Court has
    concluded that under Pennsylvania law, “‘lay persons should not be
    charged with greater knowledge of their physical condition than
    that possessed by the physicians on whose advice they must rely.’”
    
    Debiec, 352 F.3d at 131
    (quoting 
    Bohus, 950 F.2d at 929
    ).
    Although there is “some point in time when a patient’s own
    ‘common sense’ should lead her to conclude that it is no longer
    reasonable to rely on the assurances of her doctor,” this Court is
    “mindful that ‘to put upon [a patient] the duty of knowing the
    nature of her ailment and its relation to her prior treatment before
    it is ascertained with a degree of certainty by the medical profession
    is a great burden to impose upon her.’” 
    Bohus, 950 F.2d at 930
    (quoting Stauffer v. Ebersole, 
    560 A.2d 816
    , 818 (Pa. Super. Ct.
    1989)) (alteration in original). Based on the inaccurate diagnoses
    Sechrist repeatedly received from his doctors, we approve the
    District Court’s conclusion that whether Sechrist’s claim was
    barred by the statute of limitations presented a question of fact for
    the jury. See 
    Debiec, 352 F.3d at 136
    (concluding that the issue of
    reasonable diligence was for the jury to decide where the plaintiff
    consistently received inaccurate diagnoses from a doctor as to the
    cause of her injury).
    III. Conclusion
    For the foregoing reasons, we will affirm the District Court’s
    denial of judgment as a matter of law, but will reverse the District
    Court’s denial of Fenn’s motion for a new trial.12
    12
    Because we remand for a new trial, we find it unnecessary
    to consider Fenn’s additional claims that the District Court gave
    improper jury instructions, erred in excluding scientific guidelines
    for vibration exposure, and incorrectly ignored foreseeability as it
    relates to plaintiffs’ failure-to-warn claim. In addition, our holding
    renders moot Fenn’s claim that the damages awarded by the jury
    26
    were excessive and that the District Court erred in granting delay
    damages to the plaintiffs.
    27