Causation properly went to the jury

Causation represents one of the most contested battlegrounds in personal injury litigation. Plaintiffs bear the burden of proving that the defendant’s negligence was a substantial factor in causing their claimed injuries. This burden becomes exponentially more difficult when the plaintiff’s own medical records contradict their testimony about pre-existing conditions or prior injuries. Medical records created contemporaneously with treatment carry substantial evidentiary weight precisely because they are generated for treatment purposes rather than litigation, and courts recognize that healthcare providers rely on accurate patient histories to deliver appropriate care.

When contradictions emerge between a plaintiff’s trial testimony and their medical history, defense attorneys can exploit these inconsistencies to challenge both causation and credibility. Expert witnesses who render opinions based on inaccurate patient histories may be forced to reconsider their conclusions when confronted with contemporaneous records showing different facts. This creates a cascading effect: if the treating physicians’ causation opinions were premised on false information about the absence of prior injuries, those opinions lose their probative value, potentially leaving the plaintiff without competent expert testimony linking the accident to the claimed injuries.

The Cooper case from New York’s Fourth Department illustrates how appellate courts review jury verdicts on causation when conflicting evidence is presented. Under New York law, juries are entitled to credit some portions of testimony while rejecting others, and they may resolve conflicts in the evidence based on their assessment of witness credibility. Appellate courts will not disturb jury verdicts when there exists a rational process by which the jury could have reached its conclusion, even if the appellate judges might have decided differently. This deferential standard of review makes summary judgment on causation issues particularly important, as cases that survive to trial face significant appellate insulation when factual disputes exist.

Case Background

The plaintiff in Cooper v Nestoros claimed injuries to her neck and shoulder resulting from a motor vehicle accident. She sought damages for pain, suffering, and physical limitations allegedly caused by the collision. The plaintiff’s treating chiropractor testified that, based on the patient history provided, he believed the plaintiff had not suffered any neck injury prior to the accident. The chiropractor candidly acknowledged that he would need to reevaluate his causation opinion if he had been given inaccurate historical information.

The plaintiff’s orthopedic surgeon initially attributed her shoulder pain to a neck injury but later revised his opinion to conclude the pain stemmed from a shoulder injury itself. During trial, on direct examination, the plaintiff testified unequivocally that she had not suffered any neck injury before the accident. However, her medical records painted a different picture: they documented complaints of chronic neck pain occurring five months before the subject accident. This contradiction between sworn testimony and contemporaneous medical documentation became central to the defense case, ultimately leading the jury to find against the plaintiff on causation.

Jason Tenenbaum’s Analysis

Cooper v Nestoros, 2018 NY Slip Op 01716 (4th Dept. 2018)

“Plaintiff’s chiropractor testified that, based on that history, he did not believe that plaintiff had suffered a neck injury before the date of the accident, and he further testified that he would have to reevaluate his conclusion if he had been given inaccurate information. Plaintiff’s orthopedic surgeon testified that he initially believed that plaintiff’s shoulder pain was caused by an injury to her neck but ultimately concluded that it was caused by an injury to her shoulder. Although plaintiff maintained on direct examination that she did not suffer a neck injury prior to the date of the accident, that testimony was directly contradicted by her medical records, which indicated that she had complained of chronic neck pain five months before the accident. Thus, we conclude that there is a rational process by which the jury could have found that the accident was not a substantial factor in causing plaintiff’s injuries “

Legal Significance

The Fourth Department’s decision in Cooper affirms the principle that juries serve as the ultimate arbiters of credibility when conflicting evidence is presented. The court recognized that the contradiction between the plaintiff’s testimony and her medical records created a rational basis for the jury to reject her causation claim entirely. This holding underscores the heightened scrutiny that testimony receives when it conflicts with contemporaneous documentary evidence, particularly medical records created without litigation in mind.

The decision also highlights the vulnerability of expert opinions based on inaccurate patient histories. When treating physicians testify that their causation conclusions depend on the accuracy of information provided by the plaintiff, and that information is demonstrably false, the expert testimony loses its foundation. Defense counsel effectively used the chiropractor’s conditional testimony to neutralize what might otherwise have been powerful evidence linking the accident to the plaintiff’s neck complaints. This strategic impeachment demonstrates why thorough discovery of medical records predating an accident is essential to mounting effective causation defenses.

Practical Implications

For plaintiffs’ attorneys, Cooper serves as a stark reminder of the importance of thorough client preparation and candid disclosure. Plaintiffs must be instructed to provide complete and accurate information about prior medical conditions, injuries, and treatment to both their attorneys and their healthcare providers. Attempting to conceal or minimize pre-existing conditions virtually guarantees that defense counsel will discover the truth through medical records requests, and the resulting credibility damage can prove insurmountable. Proactive disclosure of prior injuries allows plaintiffs’ counsel to address causation issues affirmatively through expert testimony differentiating pre-existing conditions from accident-related aggravations or new injuries.

Defense attorneys should prioritize comprehensive discovery of plaintiffs’ pre-accident medical records, including primary care physicians, specialists, chiropractors, and emergency room visits. Cross-referencing these records against the plaintiff’s deposition testimony and expert reports often reveals contradictions that undermine causation. When such inconsistencies emerge, defense counsel should preserve the issue through specific jury instructions on credibility and the jury’s right to disbelieve testimony contradicted by documentary evidence. The Cooper decision confirms that juries may permissibly find for defendants when plaintiffs’ testimony lacks credibility, even in the absence of defense expert testimony affirmatively ruling out causation.

Related Articles

• The Need for Contemporaneous Medical Records in Personal Injury Cases
• Causation Defense Strategies in New York
• Pre-Existing Conditions and Aggravation Claims
• Expert Testimony Requirements in Personal Injury Cases