Defense expert states that injury aggravated pre-existing condition – yet jury verdict dismissing claim affirmed

Appellate review of jury verdicts operates under a highly deferential standard. Courts do not reassess credibility determinations or reweigh conflicting evidence. Rather, appellate panels ask only whether a rational process of inference from the trial evidence could support the jury’s conclusions. This standard creates a wide zone of deference for jury verdicts, even when appellate judges might personally disagree with the outcome. In personal injury cases, this deference extends to jury determinations about whether accidents caused or aggravated claimed injuries.

The Second Department’s decision in Doran v. McNulty presents a striking illustration of appellate deference to jury verdicts in serious injury threshold cases. Despite defense medical testimony acknowledging that an accident aggravated the plaintiff’s pre-existing condition, the jury awarded zero damages. The trial court, applying its independent judgment, would likely have reached a different result. Yet the appellate court affirmed the verdict, finding that conflicting expert testimony allowed the jury to reject causation entirely. Attorney Jason Tenenbaum questions whether this outcome serves justice, highlighting tensions between jury deference and substantive fairness.

Case Background

Doran v McNulty, 2013 NY Slip Op 04572 (2d Dept. 2013)

Doran involved a plaintiff who fell and allegedly sustained back injuries. At trial, the plaintiff established through her own testimony that she had experienced chronic lower back pain since age 16 and received ongoing treatment for this condition before the accident. However, she testified that her pain intensified significantly and became constant following the subject fall, requiring additional medical intervention beyond her baseline treatment regimen.

The plaintiff presented expert medical testimony opining that the fall aggravated her pre-existing degenerative disc disease and caused increased symptomatology. The defense countered with two medical experts. A radiologist reviewed the plaintiff’s post-accident MRI films and testified that the findings reflected only degenerative changes that could not have resulted from an acute traumatic event like a fall. This expert attributed the plaintiff’s condition entirely to progressive degenerative processes unrelated to the accident.

More problematically for the defense, an orthopedic surgeon called by the defendants testified that the accident did aggravate the plaintiff’s pre-existing degenerative changes in her back. However, this expert qualified his opinion by stating that the plaintiff exhibited “no radicular symptoms” as a result of the accident, suggesting that the aggravation produced no significant clinical consequences. The jury, faced with this complex and internally contradictory expert testimony, returned a verdict awarding the plaintiff zero damages.

Jason Tenenbaum’s Analysis

Doran v McNulty, 2013 NY Slip Op 04572 (2d Dept. 2013)

“At the damages trial the plaintiff testified that she had experienced, and been treated for, pain in her lower back since she was 16 years old, but the pain had become more intense and constant after the accident.”

The plaintiff’s expert testified that the fall had aggravated the plaintiff’s preexisting condition.

For the defense, a radiologist who reviewed the MRI films of the plaintiff’s back taken after the accident testified that the plaintiff’s condition could not have been caused by an acute event such as a fall, and was instead the result of the plaintiff’s preexisting degenerative disc disease.

An orthopedic surgeon called by the defendants testified that the accident aggravated the preexisting degenerative changes in the plaintiff’s back, but that the plaintiff had “no radicular symptoms” as a result of the accident. The jury awarded the plaintiff no damages.”

…

Here, a fair interpretation of the evidence supported the jury’s determination (see Verizon N.Y., Inc. v Orange & Rockland Utils., Inc., 100 AD3d 983; Piazza v Corporate Bldrs. Group, Inc., 73 AD3d at 1006-1007; Salony v Mastellone, 72 AD3d at 1061). While the plaintiff correctly notes that the orthopedic surgeon called by the defendants testified that the subject accident aggravated the preexisting degenerative changes in the plaintiff’s back, in light of the conflicting expert testimony at trial, the jury could accept or reject the testimony of a particular expert”

Does this make sense? My vote is no. Furthermore, this is not a threshold case. Plaintiff should be awarded something.

Legal Significance

Doran illustrates the breadth of jury discretion in weighing conflicting expert medical testimony. Even when a defense expert concedes that an accident aggravated a pre-existing condition, juries remain free to reject that testimony entirely if other evidence supports a contrary conclusion. The radiologist’s opinion that the plaintiff’s condition could not have resulted from acute trauma provided an alternative narrative that the jury could adopt despite the orthopedic surgeon’s partial concession of aggravation.

The decision also demonstrates how qualification and limitation of expert opinions can undermine their apparent force. The orthopedic surgeon’s acknowledgment of aggravation might seem dispositive, but his simultaneous observation that the plaintiff exhibited “no radicular symptoms” as a result of the accident suggested that any aggravation produced no clinically significant consequences. Juries may interpret such qualified opinions as effectively negating causation, reasoning that aggravation without meaningful symptoms does not constitute compensable injury.

This case raises fundamental questions about the relationship between legal causation and medical reality. From a purely medical perspective, if an accident aggravated a pre-existing condition, then the accident caused some degree of harm. Yet the legal system does not necessarily translate every instance of medical causation into compensable damages. De minimis aggravations, temporary increases in baseline symptoms, or aggravations producing no objective findings may not satisfy legal causation standards even when medical experts acknowledge some causal relationship.

The Doran result also reflects the difficulty of proving damages when plaintiffs have significant pre-existing conditions. New York follows the “eggshell plaintiff” rule, meaning defendants take plaintiffs as they find them and remain liable for aggravation of pre-existing conditions. However, plaintiffs must still prove which symptoms and limitations result from the accident versus the baseline pre-existing condition. When plaintiffs acknowledge chronic symptoms predating accidents, juries may struggle to separate accident-related aggravation from the natural progression of underlying conditions.

Practical Implications

For defendants and defense counsel, Doran demonstrates the importance of developing comprehensive medical defenses even when some defense experts make partial concessions. A single expert’s acknowledgment of aggravation does not doom the defense if other experts provide alternative causation theories and the conceding expert qualifies his opinion with limiting observations. Defense counsel should ensure that experts who acknowledge aggravation clearly articulate why that aggravation produces no compensable consequences, whether due to absence of radicular symptoms, lack of objective findings, or failure to require treatment beyond baseline levels.

Plaintiff’s counsel should recognize that defense expert concessions of aggravation, while helpful, do not guarantee favorable verdicts. Attorneys must develop testimony explaining the practical significance of aggravation, including increased pain levels, expanded treatment requirements, enhanced functional limitations, and impact on daily activities. Generic testimony that an accident “aggravated” a condition without explaining the consequences of that aggravation gives juries insufficient basis for awarding substantial damages.

The decision also underscores the importance of voir dire and jury selection in serious injury cases involving plaintiffs with significant pre-existing conditions. Some jurors harbor skepticism about plaintiffs with chronic conditions who seek compensation for accidents that allegedly worsened their baseline status. Effective voir dire should identify jurors who can appreciate that aggravation of pre-existing conditions constitutes compensable harm even when plaintiffs suffered from similar symptoms before accidents.

For trial courts, Doran illustrates the limited circumstances justifying post-verdict intervention. Even when courts believe juries reached unreasonable conclusions, the deferential standard of review constrains judicial authority to disturb verdicts. Only when no rational process of inference could support a verdict may courts set aside jury determinations. This standard reflects New York’s strong commitment to the jury system and recognition that fact-finding authority rests primarily with jurors, not judges.

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