Harris v. Shopko Stores, Inc. , 2013 Utah LEXIS 87 ( 2013 )


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  •              This opinion is subject to revision before final
    publication in the Pacific Reporter
    
    2013 UT 34
    IN THE
    SUPREME COURT OF THE STATE OF UTAH
    WENDY HARRIS,
    Respondent,
    v.
    SHOPKO STORES, INC.,
    Petitioner.
    No. 20110945
    Filed June 14, 2013
    On Certiorari from the Utah Court of Appeals
    Fourth District, American Fork Dep’t
    The Honorable Christine Johnson
    No. 070101906
    Attorneys:
    Michael E. Day, Nathan Whittaker, Murray, for respondent
    Alain C. Balmanno, Ruth A. Shapiro, Salt Lake City, for petitioner
    Brent Gordon, Idaho Falls, John P. Lowrance, South Jordan,
    amicus curiae
    CHIEF JUSTICE DURRANT, authored the opinion of the Court,
    in which ASSOCIATE CHIEF JUSTICE NEHRING,
    JUSTICE DURHAM, JUSTICE PARRISH, and JUSTICE LEE joined.
    CHIEF JUSTICE DURRANT, opinion of the Court:
    INTRODUCTION
    ¶1 Wendy Harris was injured when she sat on a display
    office chair at ShopKo Stores, Inc. (ShopKo), and the chair
    collapsed. She sued ShopKo for negligence. At the trial, evidence
    was introduced that she suffered from preexisting conditions that
    may have contributed to her injury. The trial court instructed the
    jury that, if it could, it should apportion damages between those
    attributable to ShopKo’s negligence and those attributable to her
    preexisting conditions. The jury found ShopKo negligent but
    HARRIS v. SHOPKO
    Opinion of the Court
    awarded Ms. Harris substantially less than she requested in
    damages. She appealed.
    ¶2 The court of appeals reversed the jury’s award and
    remanded for a new trial. It did so on the ground that the trial
    court had erred in giving the apportionment jury instruction. The
    court of appeals held that, because Ms. Harris’s preexisting
    conditions were asymptomatic on the date of the accident,
    ShopKo was not entitled to a jury instruction permitting the jury
    to allocate some portion of the damages to Ms. Harris’s
    preexisting conditions. We conclude that this approach is
    inconsistent with a core principle of tort law: defendants are liable
    only for those injuries proximately caused by their negligence.
    Under the court of appeals’ approach, where a plaintiff is
    experiencing no symptoms on the date of an accident, a defendant
    is liable for the full extent of the plaintiff’s injury, even though
    some portion of that injury may, in fact, have been caused by a
    preexisting condition. While we conclude the court of appeals
    erred in this regard, however, we nevertheless affirm that court’s
    grant of a new trial. We do so because at trial ShopKo did not
    present evidence sufficient for the jury to apportion damages on a
    nonarbitrary basis.
    BACKGROUND
    ¶3 On March 29, 2006, Ms. Harris went to ShopKo to buy an
    office chair. When she sat in one of the display chairs, the chair
    fell apart. Ms. Harris fell to the floor, landing on her wrist and
    tailbone. The next day, she went to the hospital after feeling “deep
    abdominal pain.” She worried that “something had come loose”
    from a previous surgery. The pain in Ms. Harris’s wrist eventually
    went away, but the abdominal pain intensified in her lower back
    and tailbone.
    ¶4 In the days after the ShopKo accident, Ms. Harris visited
    her brother, Kay Whittaker, who is a family nurse-practitioner.
    She later saw several doctors and therapists. These physicians
    observed that she suffered severe pain in her lower back and
    tailbone, which radiated down the back of her leg to her knee. Ms.
    Harris underwent a variety of treatments, including pain
    medication, physical therapy, massage therapy, and chiropractic
    care.
    ¶5 Despite the treatment she received, Ms. Harris continued
    to experience pain three years after the ShopKo accident. In 2009,
    she visited Dr. Richard Rosenthal, a pain-management specialist.
    Dr. Rosenthal diagnosed her with facet joint syndrome
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    Opinion of the Court
    (inflammation of one of the spinal joints) and coccydinia
    (inflammation of the tailbone). Dr. Rosenthal treated Ms. Harris’s
    facet joint syndrome through radio frequency lesioning—a
    treatment that stops pain by severing the nerve to the facet joint.
    To treat the coccydinia, Ms. Harris had to sit on a donut cushion
    and receive occasional injections of steroids and anesthetics to
    reduce inflammation.
    ¶6 In 2007, Ms. Harris sued ShopKo for negligence. The case
    went to a jury trial in 2009. At trial, Dr. Rosenthal testified as an
    expert in interventional pain medicine. He stated that facet joint
    syndrome is not always trauma related and can be caused by
    degenerative disc disorder due to aging. He testified that it is
    more likely than not that the ShopKo accident caused Ms. Harris’s
    pain and injury. He also testified that Ms. Harris received a single
    treatment for possible back pain in 2002, although her chief
    complaint at the time was leg pain.
    ¶7 Dr. Rosenthal further testified that Ms. Harris had been in
    three automobile accidents prior to the ShopKo accident. As a
    result, she had received treatment for neck and back pain,
    although “there was no subsequent treatment for back pain in any
    of those accidents.” Dr. Rosenthal mentioned that he saw two
    references to fibromyalgia, which he described as a “chronic
    condition,” in Ms. Harris’s records from 2001 but did not believe
    fibromyalgia caused her pain after the ShopKo accident. He stated
    that he believed Ms. Harris’s pain would eventually go away but
    that she may face permanent complications from her injuries.
    Finally, he testified that Ms. Harris’s medical treatment was
    reasonable.
    ¶8 Following Dr. Rosenthal’s testimony, Ms. Harris called,
    among others, Dr. Eric Hogenson, Mr. Kay Whittaker, and
    Dr Rodney Scuderi to testify. Each witness testified that he treated
    Ms. Harris after the ShopKo accident. First, Dr. Hogenson,
    Ms. Harris’s family-practice physician, testified that he treated
    Ms. Harris for back pain. He testified that her back pain began
    after the ShopKo incident. He also testified that Ms. Harris’s
    records indicate that he treated her for fibromyalgia and
    depression in 1997. Second, Mr. Whittaker, a family nurse-
    practitioner, also treated Ms. Harris for back pain shortly after the
    ShopKo incident. He testified that he ordered x-rays and that the
    x-rays did not show any fractures. Finally, Dr. Scuderi,
    Ms. Harris’s chiropractor, testified that he treated Ms. Harris
    shortly after the ShopKo incident. He testified that, in his opinion,
    her fall at ShopKo caused her lower-back injury. He also testified
    3
    HARRIS v. SHOPKO
    Opinion of the Court
    that his treatment of her was reasonable, although it did not
    provide lasting relief.
    ¶9 On cross-examination, ShopKo presented Dr. Scuderi
    with records of Ms. Harris’s past medical treatment. These records
    included a 1998 hospital visit for “cervical strain and to rule out a
    disc herniation”; a 2001 hospital visit following a car accident for
    “diffuse neck pain”; and a 2002 hospital visit for “excruciating
    discomfort in the lumbar area,” which led to a diagnosis of “left
    leg pain and questionable sciatica.” Dr. Scuderi then explained
    that Ms. Harris’s symptoms after the ShopKo incident were not
    consistent with a chronic condition. He noted that “[i]t’s not
    unusual for a patient of Ms. Harris’s age to have some neck and
    back pain.” On redirect, Dr. Scuderi testified that nothing in
    Ms. Harris’s past medical records indicated that she had a chronic
    lower-back condition prior to visiting him.
    ¶10 Dr. Alan Colledge testified for ShopKo. He practices
    family medicine and treated Ms. Harris a total of five times after
    the ShopKo accident. He testified that he could not conclude that
    the ShopKo incident was the cause of Ms. Harris’s pain, stating
    that he “just report[s] the news” and “do[esn’t] know where [the
    pain] comes from.” He testified that the results of Ms. Harris’s
    MRI and x-rays were “normal” and that her sacroiliac joint looked
    “fairly normal.” He then testified that a sign of degenerative disc
    disease is an annular tear. Dr. Colledge believed that Ms. Harris
    had “an annular tear or . . . traumatized the disc complex” in her
    back and that “she had some trauma.” He also testified that
    Ms. Harris’s questionable sciatica in 2002 could potentially play a
    role in her current pain. Ms. Harris’s counsel pointed out on cross-
    examination that the radiologists disagreed as to whether
    Ms. Harris had an annular tear.
    ¶11 Dr. Colledge further testified that Ms. Harris had back
    pain consistent with degenerative disc disease. He acknowledged
    that facet disease can be caused by a single incident of trauma and
    that it can also be “brought to light” by trauma. But he believed
    that Ms. Harris “probably ha[d] a component of” both
    degenerative disc disease and facet disease or an aggravation of
    both. Moreover, Dr. Colledge testified that degenerative disc
    disease can be asymptomatic and that a traumatic incident can
    cause it “to go from more of an asymptomatic to symptomatic
    state.” Finally, he testified that Ms. Harris’s pain is still
    “extraordinary” and “more than what [he] would usually see” for
    an annular tear or facet disease after nine months. He thought
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    Opinion of the Court
    Ms. Harris’s use of narcotics and her involvement in the present
    lawsuit could be delaying her recovery.
    ¶12 At the close of trial, the district court instructed the jury
    concerning “[a]ggravation of symptomatic preexisting conditions”
    (Apportionment Instruction). The Apportionment Instruction
    read as follows:
    If Plaintiff had a physical, emotional, or mental
    condition before the time of the March 29, 2006
    incident, she is not entitled to recover damages for
    that condition or disability. However, Plaintiff is
    entitled to recover damages for any aggravation of
    the pre-existing condition that was caused by
    Defendant’s fault, even if Plaintiff’s pre-existing
    condition made her more vulnerable to physical or
    emotional harm than the average person. This is true
    even if another person may not have suffered any
    harm from the event at all.
    When a pre-existing condition makes the damages
    from injuries greater than they would have been
    without the condition, it is your duty to try to
    determine what portion of the physical, emotional or
    mental harm to Plaintiff was caused by the pre-
    existing condition and what portion was caused by
    the March 29, 2006 fall.
    If you are not able to make such an apportionment,
    then you must conclude that the entire physical,
    emotional and mental harm to Plaintiff was caused
    by Defendant’s fault.
    ¶13 Ms. Harris objected to the Apportionment Instruction
    because it “talks about an aggravation of symptomatic preexisting
    conditions, and . . . the evidence in this case does not support that
    finding.” Ms. Harris also objected that there was no expert
    testimony to guide the jury on how to apportion damages. The
    court overruled her objections because “Dr. Colledge testified that
    [the ShopKo accident] may have aggravated a degenerative disc
    disorder[,] [s]o there is evidence of a preexisting condition.”
    5
    HARRIS v. SHOPKO
    Opinion of the Court
    ¶14 Ms. Harris requested $72,777.34 for past and future
    medical expenses.1 Although the jury found ShopKo negligent, it
    awarded her only $25,000 for those expenses, plus $1,000 in
    noneconomic damages.2 Ms. Harris filed a motion for a new trial,
    or, in the alternative, additur of damages. The trial court denied
    her motion. Ms. Harris appealed.
    ¶15 The court of appeals reversed and remanded for a new
    trial. Relying on Biswell v. Duncan,3 it held that the trial court erred
    in giving the Apportionment Instruction because there was no
    evidence that Ms. Harris’s preexisting conditions were
    symptomatic at the time she fell at ShopKo.4 The court also found
    that the Apportionment Instruction prejudiced Ms. Harris because
    “had the [improper] instruction [not] been given, the jury might
    have awarded more damages.”5 We granted ShopKo’s petition for
    certiorari and have jurisdiction pursuant to section 78A-3-
    102(3)(a) of the Utah Code.
    STANDARD OF REVIEW
    ¶16 “On certiorari we review the decision of the court of
    appeals, not the decision of the trial court. In doing so, we review
    for correctness, giving the court of appeals’ conclusions of law no
    deference.”6
    ANALYSIS
    ¶17 The court of appeals reversed the jury’s award and
    remanded for a new trial on the ground that the trial court erred
    in giving the Apportionment Instruction. On certiorari, ShopKo
    argues that the court of appeals applied the wrong legal standard
    when it concluded that preexisting conditions must be
    symptomatic on the day of the accident in order to justify
    1 Harris v. ShopKo Stores, Inc., 
    2011 UT App 329
    , ¶ 11, 
    263 P.3d 1184
    .
    2   
    Id.
    3   
    742 P.2d 80
     (Utah Ct. App. 1987).
    4   Harris, 
    2011 UT App 329
    , ¶¶ 14, 24.
    5 Id. ¶ 25 (alterations in original) (internal quotation marks
    omitted).
    6Grand Cnty. v. Rogers, 
    2002 UT 25
    , ¶ 6, 
    44 P.3d 734
     (internal
    quotation marks omitted).
    6
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    Opinion of the Court
    apportioning damages. ShopKo also argues that the court of
    appeals erred in holding that there was insufficient evidence to
    support giving the Apportionment Instruction.
    ¶18 We decline to adopt the legal standard applied by the
    court of appeals because it requires a bright-line approach that is
    inconsistent with the principle of proximate cause, which should
    be the overarching and guiding principle in the analysis. But we
    nevertheless agree that the Apportionment Instruction was
    improper because the evidence at trial failed to provide a
    nonarbitrary basis for the jury to apportion damages. We
    therefore affirm the court of appeals’ decision to order a new trial
    in this case.
    I. WE DECLINE TO ADOPT THE COURT OF APPEALS’
    APPROACH OF REQUIRING PREEXISTING CONDITIONS TO
    BE SYMPTOMATIC ON THE DAY OF THE ACCIDENT IN
    ORDER FOR AN APPORTIONMENT INSTRUCTION TO BE
    PROPER
    ¶19 In deciding whether the Apportionment Instruction was
    properly given, the court of appeals determined that the “crucial
    question” in the analysis is whether the preexisting condition was
    symptomatic on the date of the injury.7 Under the court’s
    approach, a preexisting condition provides a basis for
    apportionment if, but only if, it is symptomatic on the date of the
    tortious conduct.8 Thus, in the eyes of the court, “a victim with
    latent, dormant, or otherwise asymptomatic pre-existing
    conditions stands on equal footing with a victim with no pre-
    existing conditions.”9 In other words, under the court’s analysis, a
    preexisting condition that is asymptomatic on the date of the
    accident cannot justify any reduction in damages.
    ¶20 In assigning determinative effect to whether a preexisting
    condition is symptomatic or asymptomatic on the injury date, the
    court of appeals relied on its decision in Biswell v. Duncan.10
    Biswell involved a plaintiff who had a preexisting condition that
    7 Harris v. ShopKo Stores, Inc., 
    2011 UT App 329
    , ¶ 23, 
    263 P.3d 1184
    .
    8   Id. ¶¶ 23, 27.
    9   Id. ¶ 17.
    10   Id. ¶¶ 17, 22–24.
    7
    HARRIS v. SHOPKO
    Opinion of the Court
    she claimed had been “resolved” and therefore did not cause pain
    prior to the accident.11 The court stated that “when a defendant’s
    negligence aggravates . . . a latent, dormant, or asymptomatic
    condition, . . . the defendant is liable . . . for the full amount of
    damages which ensue.”12 The court elaborated:
    [W]hen a latent condition itself does not cause pain,
    but that condition plus an injury brings on pain by
    aggravating the pre-existing condition, then the
    injury, not the dormant condition, is the proximate
    cause of the pain and disability. A plaintiff,
    therefore, is entitled to recover all damages which
    actually and necessarily follow the injury.13
    ¶21 The court of appeals quoted this language from Biswell in
    the instant case to support its conclusion that when a condition is
    asymptomatic on the date of the accident, the negligence will be
    deemed the proximate cause of the entire injury, and the
    preexisting condition will be disregarded.14 Thus, by determining
    that Ms. Harris’s conditions were asymptomatic on the date of the
    accident and that the Apportionment Instruction was improper,
    the court assumed that Ms. Harris’s preexisting conditions could
    not have caused any portion of her pain and injury.
    ¶22 That the court of appeals would adopt this approach is
    certainly understandable given that other jurisdictions have
    followed a similar approach,15 but we decline to adopt it. We
    conclude that our case law—which recognizes the central role
    proximate cause must play in tort law—is inconsistent with such a
    narrow, bright-line approach.
    11   
    742 P.2d 80
    , 88 (Utah Ct. App. 1987).
    12   
    Id.
    13   
    Id.
    14   Harris, 
    2011 UT App 329
    , ¶ 23.
    15 See, e.g., Sleeth v. Louvar, 
    659 N.W.2d 210
    , 213–16 (Iowa 2003)
    (finding error in instructing the jury on aggravation where there
    was no evidence that plaintiff’s preexisting arthritis was
    symptomatic prior to the accident at issue). But see 
    id. at 217
    (Carter, J., dissenting) (arguing that, given the evidence in the
    case, the jury should have been able to decide whether some or all
    of plaintiff’s pain would have occurred even absent the accident).
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    Opinion of the Court
    ¶23 In Brunson v. Strong, we recognized that “one who injures
    another takes him as he is.”16 Thus, a plaintiff is entitled to recover
    for all harm that is proximately caused by the defendant’s
    negligence, “even if a given plaintiff is more vulnerable to injury
    than others.”17 But this principle, commonly known as the
    eggshell plaintiff doctrine, in no way bars consideration of other
    relevant potential sources of a plaintiff’s pain in determining the
    extent of damage proximately caused by the defendant.
    ¶24 Indeed, we further recognized in Brunson that although
    an injured party is taken “as he is, nevertheless the plaintiff may
    not recover damages for any pre-existing condition or disability
    she may have had which did not result from any fault of the
    defendant.”18 And while “she is entitled to recover damages for
    any injury she suffered, including any aggravation . . . of such a
    pre-existing condition,” she may only do so to the extent that the
    aggravation “was proximately caused by the defendant’s negligence.”19
    Moreover, in Tingey v. Christensen, we stated that “if the jury can
    find a reasonable basis for apportioning damages between a
    preexisting condition and a subsequent tort, it should do so.”20
    ¶25 These cases highlight the fundamental aim in deciding
    damages: “to restore the injured party to the position he would
    have been in had it not been for the wrong of the other party.”21
    Proximate cause plays a central role in determining the precise
    extent of the defendant’s liability and, in turn, what the plaintiff’s
    position would have been absent the defendant’s negligence.22
    16   Brunson v. Strong, 
    412 P.2d 451
    , 453 (Utah 1966).
    17   Ryan v. Gold Cross Servs., Inc., 
    903 P.2d 423
    , 428 (Utah 1995).
    18 Brunson, 412 P.2d at 453 (emphasis added) (footnote
    omitted).
    19   Id. (emphasis added).
    20   
    1999 UT 68
    , ¶ 15, 
    987 P.2d 588
    .
    21   Park v. Moorman Mfg. Co., 
    241 P.2d 914
    , 920 (Utah 1952).
    22  See Raab v. Utah Ry. Co., 
    2009 UT 61
    , ¶ 22, 
    221 P.3d 219
    (“[T]he ‘legal cause’ inquiry focuses on the question of whether
    liability should attach to a particular cause in fact.”); id. ¶ 35
    (“[A]ssessment of legal responsibility for a cause in fact of an
    injury is the raison d’etre of the proximate cause requirement.”);
    Williams v. Barber, 
    765 P.2d 887
    , 889 (Utah 1988) (“With respect to
    (Continued)
    9
    HARRIS v. SHOPKO
    Opinion of the Court
    ¶26 The eggshell plaintiff doctrine does not alter this aim. It
    has never required tortfeasors to compensate plaintiffs for
    damages that the tortfeasors’ negligence did not proximately
    cause.23 In our view, however, the court of appeals’ narrow,
    bright-line approach to the eggshell plaintiff doctrine is
    inconsistent with this aim of awarding damages. An
    asymptomatic preexisting condition may well be an independent
    contributor to a plaintiff’s pain and injury, which was also
    proximately caused to some degree by a tortfeasor’s negligence.24
    But the court of appeals’ approach would prevent the jury from
    apportioning damages between the preexisting condition and the
    negligence simply because the preexisting condition was not
    symptomatic on the date of the accident. In our view, this result is
    potentially arbitrary and risks holding defendants liable for more
    than they proximately caused in damages. We accordingly
    conclude that whether a preexisting condition is symptomatic or
    asymptomatic on the date of the accident is not the determinative
    factor in granting an apportionment instruction.25
    tort liability generally, a finding of proximate cause must be made
    by the trier of fact before an award for damages is granted.”).
    23 See, e.g., Gibson v. Cnty. of Washoe, Nev., 
    290 F.3d 1175
    , 1192–
    93 (9th Cir. 2002) (discussing the eggshell plaintiff doctrine and
    recognizing that “[t]he defendant of course is liable only for the
    extent to which the defendant’s conduct has resulted in an
    aggravation of the pre-existing condition, and not for the
    condition as it was” (internal quotation marks omitted)).
    24 See, e.g., Maurer v. United States, 
    668 F.2d 98
    , 100 (2d Cir.
    1981) (per curiam) (stating that “when a plaintiff has a preexisting
    condition that would inevitably worsen, a defendant causing
    subsequent injury is entitled to have the plaintiff’s damages
    discounted to reflect the proportion of damages that would have
    been suffered even in the absence of the subsequent injury”); see
    also Sauer v. Burlington N. R.R. Co., 
    106 F.3d 1490
    , 1495 (10th Cir.
    1996) (citing cases that recognize this proposition).
    25 We also note that, to the extent that the court of appeals’
    approach requires evidence of symptoms on the precise date of
    the injury, it is inconsistent with our decision in Tingey, where we
    held that evidence of pain from a preexisting condition twenty-
    five days before an accident was sufficient to justify a jury’s
    (Continued)
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    Opinion of the Court
    ¶27 While we reaffirm the jury’s duty to apportion damages if
    the evidence supports doing so, we recognize that it is rarely easy
    to determine the causal contribution of a preexisting condition to
    a plaintiff’s pain and injury. The “[o]bjective symptoms and the
    physical basis of . . . ailment[s] are often difficult to discover,
    analyze and demonstrate to others.”26 If the preexisting condition
    is asymptomatic at the time of the tortious conduct, the analysis
    will be even more difficult. But the “evaluation and the conclusion
    to be drawn [from the evidence] is peculiarly within the province
    of the jury.”27 Indeed, proximate cause—although often a thorny
    issue—is generally a question of fact for the jury to decide.28
    ¶28 We are also confident that our case law already provides
    sufficient protection for eggshell-type plaintiffs even without the
    court of appeals’ bright-line approach. In Tingey, we recognized
    that “a tortfeasor should bear the burden of uncertainty in the
    amount of a tort victim’s damages.”29 We accordingly held that
    while a jury should apportion if it can, “it should find that the
    tortfeasor is liable for the entire amount of damages” if it “finds it
    impossible to apportion.”30 Thus, the burden is on the defendant
    to demonstrate that apportionment is possible where there is any
    uncertainty.31
    conclusion that the preexisting condition was the cause of harm
    suffered after the accident. 
    1999 UT 68
    , ¶ 18.
    26   Brunson, 412 P.2d at 453.
    27   Id.
    28 Crestwood Cove Apartments Bus. Trust v. Turner, 
    2007 UT 48
    ,
    ¶ 31, 
    164 P.3d 1247
    ; Harline v. Barker, 
    912 P.2d 433
    , 439 (Utah
    1996). The two circumstances in which proximate cause may be
    decided as a matter of law are “(i) when the facts are so clear that
    reasonable persons could not disagree about the underlying facts
    or about the application of a legal standard to the facts, and
    (ii) when the proximate cause of an injury is left to speculation so
    that the claim fails as a matter of law.” Crestwood Cove, 
    2007 UT 48
    ,
    ¶ 32 (internal quotation marks omitted).
    29   
    1999 UT 68
    , ¶ 14.
    30   Id. ¶ 15.
    31  See Robinson v. All-Star Delivery, Inc., 
    1999 UT 109
    , ¶ 13 n.3,
    
    992 P.2d 969
     (discussing a tortfeasor’s liability when the evidence
    at trial is uncertain as to apportionability of damages).
    11
    HARRIS v. SHOPKO
    Opinion of the Court
    ¶29 Finally, we emphasize that our decision today is not an
    invitation for tortfeasors to dredge up every physical injury or
    defect a victim has ever had in an attempt to reduce liability.
    Evidence of preexisting conditions must be relevant to the pain or
    injury at issue and must also overcome other pertinent
    evidentiary hurdles in order to be admissible.32 If there is no
    evidence that a particular preexisting condition is relevant to the
    plaintiff’s pain or injury, evidence of that condition should not be
    admitted.
    ¶30 Because a jury should apportion damages if the evidence
    indicates that the defendant’s conduct was not the sole proximate
    cause of the plaintiff’s injury, we decline to adopt the court of
    appeals’ bright-line approach of focusing on whether the
    condition was asymptomatic or symptomatic on the date of the
    accident. We next consider whether there was sufficient evidence
    to support giving the Apportionment Instruction in this case.
    II. THE APPORTIONMENT INSTRUCTION WAS ERRONEOUS
    BECAUSE THE EVIDENCE AT TRIAL DID NOT PROVIDE THE
    JURY WITH A NONARBITRARY BASIS FOR APPORTIONING
    DAMAGES
    ¶31 The court of appeals concluded that there was insufficient
    evidence to support the Apportionment Instruction.33 As
    discussed above, this conclusion was a product of the court’s
    bright-line approach to symptomatic and asymptomatic
    preexisting conditions, which we have declined to adopt. We
    must now consider whether the evidence at trial supported the
    Apportionment Instruction. While we recognize that there was, as
    the trial court found, expert testimony that Ms. Harris had a
    preexisting condition, we conclude that this testimony alone was
    insufficient to support the Apportionment Instruction because it
    did not address the extent to which Ms. Harris’s condition may
    have contributed to her injury and pain.34
    32   See, e.g., UTAH R. EVID. 401, 402, 403.
    33   Harris v. ShopKo Stores, Inc., 
    2011 UT App 329
    , ¶ 24, 
    263 P.3d 1184
    .
    34 Ms. Harris also argues that we can affirm the court of
    appeals’ decision on the alternative ground that the trial court
    improperly instructed the jury to reduce future damages to
    present value. We decline to reach this issue given our conclusion
    (Continued)
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    Opinion of the Court
    ¶32 “The jury is entrusted to resolve all relevant questions of
    fact presented to the court,” including “apportionment.”35
    Nevertheless, the jury must have a reasonable basis for
    apportioning damages,36 and apportionment may not be based on
    “pure speculation.”37 A jury instruction on apportionment,
    therefore, requires that there be some nonarbitrary evidentiary
    basis for the jury to apportion damages.38
    ¶33 In other contexts, we have declined to require expert
    testimony on apportionment. In fact, we have held that such
    expert testimony should be precluded in certain circumstances.
    For example, in Steffensen v. Smith’s Management Corp., a
    comparative negligence case, we held that the trial court did not
    abuse its discretion by excluding expert testimony on
    apportioning fault because the testimony would not have been
    “helpful to the fact finder” and “the apportionment of
    that there was insufficient evidence to support the Apportionment
    Instruction.
    35 Little Am. Ref. Co. v. Leyba, 
    641 P.2d 112
    , 114 (Utah 1982); see
    also Anderson v. Bradley, 
    590 P.2d 339
    , 342 (Utah 1979) (“[I]t is the
    jury’s prerogative to decide questions of [comparative]
    negligence.”).
    36 See Egbert v. Nissan Motor Co., 
    2010 UT 8
    , ¶ 37, 
    228 P.3d 737
    (“[F]or a jury to apportion relative fault between two parties, the
    jury, of necessity, must have sufficient evidence of the culpability of
    each party to make that apportionment.” (internal quotation
    marks omitted)); see also Osuala v. Olsen, 
    609 P.2d 1325
    , 1326 (Utah
    1980) (“There is substantial, credible evidence here, together with
    reasonable inference to be drawn therefrom, by which the Court,
    as factfinder, could apportion the negligence between the parties
    as it did.”); Lamkin v. Lynch, 
    600 P.2d 530
    , 531–32 (Utah 1979)
    (refusing to disturb an apportioned jury award because “the jury
    could reasonably conclude” from the evidence that the
    apportionment was appropriate); Anderson, 590 P.2d at 342
    (“From the record it appears that the jury reasonably concluded
    that plaintiff and defendant were equally negligent, and it is the
    jury’s prerogative to decide questions of driver’s and pedestrian’s
    negligence.”).
    37   Egbert, 
    2010 UT 8
    , ¶ 37.
    38   Tingey v. Christensen, 
    1999 UT 68
    , ¶ 15, 
    987 P.2d 588
    .
    13
    HARRIS v. SHOPKO
    Opinion of the Court
    negligence . . . was exclusively the jury’s responsibility.”39 But
    finding fault is normally an exercise in common sense of which
    jurors and experts are equally capable.40 Thus, the nonarbitrary
    basis for apportioning damages in cases like Steffensen can be
    found in the jury’s common experience.
    ¶34 This is often not true when allocating causation between
    preexisting pathologies and a subsequent accident. Where
    apportionment depends on the competing causal influences of a
    defendant’s negligence and a preexisting medical condition, as it
    does in this case, common experience is a poor substitute for
    expert guidance.41 This is because the average lay juror is ill-
    equipped to sift through complicated medical evidence and come
    to a nonspeculative apportionment decision.42 In cases like this,
    expert testimony may be the jury’s only guide as to whether
    apportionment is proper and, if so, to what extent.
    ¶35 In the instant case, we conclude that expert testimony
    allocating causation between Ms. Harris’s preexisting conditions
    and her fall at ShopKo was necessary in order for an
    39  
    862 P.2d 1342
    , 1347–48 (Utah 1993); see also UTAH R. EVID.
    702(a) (“[A] witness who is qualified as an expert by knowledge,
    skill, experience, training, or education may testify in the form of
    an opinion or otherwise if the expert’s scientific, technical, or
    other specialized knowledge will help the trier of fact to understand
    the evidence or to determine a fact in issue.” (emphasis added)).
    40 See Leyba, 641 P.2d at 114 (stating that apportionment of fault
    is entrusted to juries).
    41 See Martin v. Owens-Corning Fiberglas Corp., 
    528 A.2d 947
    , 950
    (Pa. 1987) (plurality opinion) (“[C]ommon sense and common
    experience possessed by a jury do not serve as substitutes for
    expert guidance, and it follows that any apportionment by the
    jury in this case was a result of speculation and conjecture and
    hence, improper.”); Lee v. Pittsburgh Corning Corp., 
    616 A.2d 1045
    ,
    1048 (Pa. Super. Ct. 1992) (same).
    42 Cf. Bowman v. Kalm, 
    2008 UT 9
    , ¶ 7, 
    179 P.3d 754
     (stating that
    the “general requirement in medical malpractice cases that the
    element of proximate cause be supported by expert testimony” is
    grounded in the idea that “the causal link between the negligence
    and the injury [is] usually not within the common knowledge of
    the lay juror”).
    14
    Cite as: 
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    Opinion of the Court
    apportionment instruction to be given. The evidence supports a
    reasonable inference that Ms. Harris had previously suffered
    injuries in car accidents and that she had a number of preexisting
    conditions at the time of her fall. For example, Dr. Colledge, who
    testified for ShopKo, stated that he believed Ms. Harris had an
    annular tear, which could be a sign of degenerative disc disease.
    He also testified that Ms. Harris’s back pain was consistent with
    degenerative disc disease and suggested that her facet joint
    syndrome may have predated, and been aggravated by, her fall at
    ShopKo.
    ¶36 And there is also testimony indicating that these
    preexisting conditions contributed to Ms. Harris’s pain and that
    they would have caused similar symptoms even in the absence of
    her fall at ShopKo. Dr. Rosenthal testified that the facet joint
    syndrome, which he had diagnosed Ms. Harris with after her fall,
    can be caused by degenerative disc disorder. Dr. Scuderi testified
    that it was “not unusual” for somebody of “Ms. Harris’s age to
    have some neck and back pain.” And Dr. Colledge testified that
    degenerative disc disease and Ms. Harris’s prior “questionable
    sciatica” could have contributed to her symptoms.
    ¶37 But while this testimony suggests some connection
    between Ms. Harris’s preexisting conditions and her current pain,
    there is no expert testimony in the record on the extent to which
    her conditions contributed to her pain, if at all. In fact,
    Dr. Colledge refused to offer such an opinion, stating that he “just
    report[s] the news” and “do[esn’t] know where [the pain] comes
    from.” He did testify that Ms. Harris “probably has a component
    of” both degenerative disc disease and facet disease or an
    aggravation of both. But this testimony does not provide a relative
    comparison between the proposed causes of Ms. Harris’s pain.
    Without such testimony, the jury would have had to speculate as
    to any basis for apportioning damages, especially in light of
    Ms. Harris’s expert testimony indicating that her fall at ShopKo
    caused her injury. We therefore conclude that there was
    insufficient evidence to support the Apportionment Instruction in
    this case. On remand, an apportionment instruction will be proper
    only if there is adequate expert testimony that Ms. Harris’s
    preexisting back condition contributed to her injury and, if so, to
    what extent.
    15
    HARRIS v. SHOPKO
    Opinion of the Court
    ¶38 Although expert testimony allocating causation is
    necessary for an apportionment instruction on remand, the
    testimony need not opine on the exact percentage, if any, of the
    injury attributable to Ms. Harris’s preexisting conditions.43 In an
    ideal world, an expert would provide a precise estimation (e.g.,
    “Fifty percent of the injury is attributable to the preexisting
    condition.”). But we must account for the reality of medical
    uncertainty. An apportionment instruction will not be precluded
    if the testimony presents a reasonable range of percentages (e.g.,
    “Forty to sixty percent of the injury is attributable to the
    preexisting condition.”) or a useful nonnumeric description (e.g.,
    “The vast majority of the injury is attributable to the preexisting
    condition.”).44 The determinative question is whether the expert
    testimony has supplied the jury with a nonarbitrary basis for
    apportioning damages.
    ¶39 Finally, ShopKo argues that even if the Apportionment
    Instruction was erroneous, it was harmless because the jury may
    have awarded Ms. Harris less than she requested on the ground
    that some of her medical care was not reasonably necessary. We
    disagree. An erroneous jury instruction is prejudicial if, taken “in
    context” with “the jury instructions as a whole,”45 “it misadvised
    or misled the jury on the law.”46 The law on apportionment to
    43 See Egbert, 
    2010 UT 8
    , ¶ 37 (“sufficient evidence is not pure
    speculation, but neither does it require . . . precise, specific
    evidence” (internal quotation marks omitted)); see also Sauer v.
    Burlington N. R.R. Co., 
    106 F.3d 1490
    , 1494 (10th Cir. 1996) (“The
    extent to which an injury is attributable to a preexisting condition
    or prior accident need not be proved with mathematical precision
    or great exactitude. The evidence need only be sufficient to permit
    a rough practical apportionment.”).
    44 See Egbert, 
    2010 UT 8
    , ¶ 38 (“This apportionment may of
    course . . . be a rough apportionment” (internal quotation marks
    omitted)).
    45 Jensen v. Intermountain Power Agency, 
    1999 UT 10
    , ¶ 16, 
    977 P.2d 474
     (internal quotation marks omitted).
    46 Butler v. Naylor, 
    1999 UT 85
    , ¶ 10, 
    987 P.2d 41
    ; see also Jensen,
    
    1999 UT 10
    , ¶ 16 (“[I]f the jury instructions as a whole fairly
    instruct the jury on the applicable law, reversible error does not
    arise merely because one jury instruction, standing alone, is not as
    (Continued)
    16
    Cite as: 
    2013 UT 34
    Opinion of the Court
    preexisting conditions was inapplicable because, as we have
    explained, the evidence did not provide the jury a nonarbitrary
    basis to apportion damages. Nothing in the jury instructions as a
    whole cured the erroneous instruction. Indeed, the
    Apportionment Instruction went so far as to impart a “duty” for
    the jury to apportion damages in this case whereas we have
    concluded that there was nothing beyond a speculative basis for
    doing so.
    ¶40 We also note, as did the court of appeals,47 that we are
    obviously unable to know the precise basis of the jury’s award.
    Nevertheless, given the substantial testimony at trial concerning
    Ms. Harris’s preexisting conditions, ShopKo’s arguments at trial
    concerning apportionment,48 and the Apportionment Instruction
    itself, we find it “reasonably likely” that the jury apportioned
    damages to Ms. Harris’s preexisting conditions.49 Therefore, our
    “confidence in the jury’s verdict is undermined” and reversal is
    required.50
    CONCLUSION
    ¶41 The court of appeals’ bright-line approach to analyzing
    preexisting conditions, focusing exclusively on whether a
    condition was symptomatic or asymptomatic on the date of the
    accident, risks holding defendants liable for more damages than
    they proximately caused. We therefore decline to adopt it. We also
    conclude that the Apportionment Instruction was erroneous and
    prejudicial because (a) the evidence failed to supply the jury with
    a nonarbitrary basis for apportioning damages, and (b) there is a
    reasonable likelihood the jury apportioned damages. On the facts
    of Ms. Harris’s case, an apportionment instruction requires expert
    testimony on the portion of the plaintiff’s injury that is
    accurate as it might have been.” (emphasis added) (internal
    quotation marks omitted)).
    47   Harris, 
    2011 UT App 329
    , ¶ 25.
    48  At closing argument, counsel for ShopKo argued that
    Ms. Harris was “asking to be compensated for conditions that
    existed before the accident, and under the law that’s not proper.”
    49 See Cal Wadsworth Constr. v. City of St. George, 
    898 P.2d 1372
    ,
    1378–79 (Utah 1995) (“An error is harmful if it is reasonably likely
    that the error affected the outcome of the proceedings.”).
    50   Tingey, 
    1999 UT 68
    , ¶ 16.
    17
    HARRIS v. SHOPKO
    Opinion of the Court
    attributable to her preexisting conditions. Accordingly, we affirm
    and remand to the court of appeals to order a new trial consistent
    with this opinion.
    18