Key Takeaway
Court dismisses personal injury case where plaintiff failed to prove causation between car accident and cervical injuries, distinguishing new trauma from preexisting neck condition.
This article is part of our ongoing 5102(d) issues coverage, with 129 published articles analyzing 5102(d) issues issues across New York State. Attorney Jason Tenenbaum brings 24+ years of hands-on experience to this analysis, drawing from his work on more than 1,000 appeals, over 100,000 no-fault cases, and recovery of over $100 million for clients throughout Nassau County, Suffolk County, Queens, Brooklyn, Manhattan, and the Bronx. For personalized legal advice about how these principles apply to your specific situation, contact our Long Island office at (516) 750-0595 for a free consultation.
The Critical Role of Causation in Personal Injury Litigation
Establishing causation represents one of the most fundamental elements in any personal injury case. Under New York law, plaintiffs must not only prove they sustained injuries, but also demonstrate that those injuries were caused by the defendant’s negligence. This requirement becomes particularly complex when dealing with preexisting conditions, where courts must distinguish between new trauma and longstanding medical issues that preceded the accident in question.
The burden of proving causation intensifies in cases involving Insurance Law Section 5102(d), New York’s serious injury threshold. Beyond showing that an injury exists, plaintiffs must establish a causal connection between the accident and any claimed serious injuries. This causal link cannot rest on speculation or the plaintiff’s subjective history alone—it requires objective medical evidence supporting the conclusion that the accident, rather than preexisting conditions, caused the complained-of injuries.
When defendants present evidence of preexisting conditions affecting the same body parts claimed as injured, they effectively shift the burden back to plaintiffs to differentiate new trauma from old. Medical experts must provide detailed explanations distinguishing accident-related injuries from preexisting conditions, using objective diagnostic findings rather than relying solely on patient history. Failure to meet this burden proves fatal to personal injury claims, as the First Department’s decision in Bobbio v. Amboy Bus Co. demonstrates.
Case Background: Bobbio v. Amboy Bus Co.
Bobbio v Amboy Bus Co. Inc., 2016 NY Slip Op 07101 (1st Dept. 2016)
In this personal injury action, plaintiff claimed cervical injuries resulting from an accident involving defendant’s bus. However, the case presented significant complications: plaintiff had been found disabled due to a neck condition more than six years before the subject accident. Medical records revealed that an MRI of her cervical spine taken four years prior to the accident showed preexisting degenerative conditions in the same area she now claimed was injured.
Defendants moved for summary judgment, submitting medical evidence showing no objective neurological disability or permanency and documenting full range of motion in plaintiff’s cervical spine. Their orthopedic expert’s examination revealed only minor limitations that courts have consistently found insufficient to meet the serious injury threshold. More importantly, defendants highlighted plaintiff’s deposition testimony acknowledging her preexisting disability related to neck problems, effectively challenging plaintiff to prove the accident caused new and different injuries rather than merely aggravating her longstanding condition.
In opposition, plaintiff’s orthopedist acknowledged the preexisting cervical condition shown on the earlier MRI but attempted to distinguish it from the current claimed injuries. However, his opinion that the accident exacerbated the preexisting condition lacked objective medical support beyond plaintiff’s own reported history. The expert failed to explain what made the current injuries different from plaintiff’s preexisting disability or why the preexisting conditions should be ruled out as the cause of her current symptoms.
Jason Tenenbaum’s Analysis:
(1) ” found no objective neurological disability or permanency and full range of motion (see Birch v 31 N. Blvd., Inc., 139 AD3d 580 ; Mayo v Kim, 135 AD3d 624 ). Their orthopedist’s finding of minor limitations in range of motion does not defeat this showing (see Stephanie N. v Davis, 126 AD3d 502, 502 ). Defendants also relied on plaintiff’s deposition testimony that she had been found to be disabled as a result of a neck condition more than six years before the subject accident, thereby shifting the burden to plaintiff to demonstrate a causal connection between the accident and her claimed cervical injury.”
(2) “Her orthopedist acknowledged that an MRI of the cervical spine taken four years before the accident showed a preexisting condition, but he provided no objective basis, only the history supplied by plaintiff, for his opinion that the accident exacerbated the preexisting condition (see Campbell v Fischetti, 126 AD3d 472, 473 ). Plaintiff offered no evidence of any injuries different from her preexisting condition, and her orthopedist failed to explain why her preexisting conditions were ruled out as the cause of her current alleged injuries”
On causation (and we are assuming the only issue is cervical injury), a prima facie showing was satisfied through a disability caused because of a neck injury. The failure to adduce that the injuries were different as a result of the new injury was fatal to plaintiff’s case.
Legal Significance: Distinguishing New Injuries from Preexisting Conditions
The First Department’s analysis establishes strict requirements for proving causation when preexisting conditions affect the claimed injury site. The court rejected plaintiff’s expert opinion because it relied on subjective history rather than objective medical findings to distinguish new trauma from preexisting pathology. This holding reinforces that medical experts cannot simply accept a plaintiff’s narrative about accident causation—they must provide independent, objective evidence supporting their conclusions.
The decision emphasizes that acknowledging a preexisting condition is insufficient without explaining how the current injuries differ from that condition. Plaintiff’s expert admitted the preexisting cervical pathology but failed to identify what made the post-accident condition distinct or worse. This gap in proof proved fatal because it left the court unable to determine whether plaintiff’s current symptoms stemmed from the recent accident or her longstanding neck problems.
The ruling also demonstrates how deposition testimony can create insurmountable causation problems. Plaintiff’s admission that she had been disabled due to neck problems years before the accident gave defendants powerful ammunition. Once this testimony entered the record, plaintiff bore the burden of proving the accident caused new, different injuries rather than simply continuing or aggravating her preexisting disability—a burden she failed to meet.
Practical Implications for Personal Injury Cases
This decision offers critical guidance for both plaintiffs and defendants handling cases involving preexisting conditions. For plaintiffs’ counsel, the case underscores the importance of thorough medical investigation before filing suit. Attorneys must identify any preexisting conditions affecting claimed injury sites and ensure their experts can objectively distinguish new trauma from old pathology. Relying on patient history alone will not suffice when medical records document preexisting problems in the same anatomical areas.
Medical experts testifying for plaintiffs with preexisting conditions must provide detailed explanations of how they differentiated accident-related injuries from longstanding conditions. This requires comparing pre-accident and post-accident diagnostic studies, identifying new findings not present in earlier imaging, and explaining why current symptoms cannot be attributed to preexisting pathology. Generic opinions about “aggravation” or “exacerbation” without objective support will fail under scrutiny.
For defense counsel, this case illustrates the power of discovery in causation challenges. Thorough deposition questioning about prior injuries, disabilities, and medical treatment can reveal preexisting conditions that undermine causation. Medical records from before the accident provide objective evidence that may contradict plaintiffs’ claims of new injuries. When coupled with defense medical examinations showing normal findings or only minor limitations, evidence of preexisting conditions can defeat even facially strong personal injury claims by exposing the absence of proof that the accident caused the claimed injuries.
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Legal Context
Why This Matters for Your Case
New York law is among the most complex and nuanced in the country, with distinct procedural rules, substantive doctrines, and court systems that differ significantly from other jurisdictions. The Civil Practice Law and Rules (CPLR) governs every stage of civil litigation, from service of process through trial and appeal. The Appellate Division, Appellate Term, and Court of Appeals create a rich and ever-evolving body of case law that practitioners must follow.
Attorney Jason Tenenbaum has practiced across these areas for over 24 years, writing more than 1,000 appellate briefs and publishing over 2,353 legal articles that attorneys and clients rely on for guidance. The analysis in this article reflects real courtroom experience — from motion practice in Civil Court and Supreme Court to oral arguments before the Appellate Division — and a deep understanding of how New York courts actually apply the law in practice.
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Dec 25, 2014Common Questions
Frequently Asked Questions
What is the serious injury threshold under Insurance Law §5102(d)?
New York Insurance Law §5102(d) defines 'serious injury' as a personal injury that results in death, dismemberment, significant disfigurement, a fracture, loss of a fetus, permanent loss of use of a body organ, member, function or system, permanent consequential limitation of use of a body organ or member, significant limitation of use of a body function or system, or a medically determined injury that prevents the person from performing substantially all of their daily activities for at least 90 of the first 180 days following the accident.
Why does the serious injury threshold matter?
In New York, you cannot sue for pain and suffering damages in a motor vehicle accident case unless your injuries meet the serious injury threshold. This is a critical hurdle in every car accident lawsuit. Insurance companies aggressively challenge whether plaintiffs meet this threshold, often relying on IME doctors who find no objective limitations. Successfully establishing a serious injury requires detailed medical evidence, including quantified range-of-motion findings and correlation to the accident.
How is causation established in New York personal injury cases?
Causation requires proof that the defendant's conduct was a substantial factor in causing the plaintiff's injuries. In motor vehicle and slip-and-fall cases, medical experts typically establish causation through review of the patient's medical history, diagnostic imaging, clinical examination findings, and the temporal relationship between the accident and the onset of symptoms. The plaintiff must also address any pre-existing conditions and demonstrate that the accident was a proximate cause of the current complaints.
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About the Author
Jason Tenenbaum, Esq.
Jason Tenenbaum is the founding attorney of the Law Office of Jason Tenenbaum, P.C., headquartered at 326 Walt Whitman Road, Suite C, Huntington Station, New York 11746. With over 24 years of experience since founding the firm in 2002, Jason has written more than 1,000 appeals, handled over 100,000 no-fault insurance cases, and recovered over $100 million for clients across Long Island, Nassau County, Suffolk County, Queens, Brooklyn, Manhattan, the Bronx, and Staten Island. He is one of the few attorneys in the state who both writes his own appellate briefs and tries his own cases.
Jason is admitted to practice in New York, New Jersey, Florida, Texas, Georgia, and Michigan state courts, as well as multiple federal courts. His 2,353+ published legal articles analyzing New York case law, procedural developments, and litigation strategy make him one of the most prolific legal commentators in the state. He earned his Juris Doctor from Syracuse University College of Law.
Disclaimer: This article is published by the Law Office of Jason Tenenbaum, P.C. for informational and educational purposes only. It does not constitute legal advice, and no attorney-client relationship is formed by reading this content. The legal principles discussed may not apply to your specific situation, and the law may have changed since this article was last updated.
New York law varies by jurisdiction — court decisions in one Appellate Division department may not be followed in another, and local court rules in Nassau County Supreme Court differ from those in Suffolk County Supreme Court, Kings County Civil Court, or Queens County Supreme Court. The Appellate Division, Second Department (which covers Long Island, Brooklyn, Queens, and Staten Island) and the Appellate Term (which hears appeals from lower courts) each have distinct procedural requirements and precedents that affect litigation strategy.
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