Key Takeaway
Court case highlights crucial distinction between reviewing MRI reports versus actual films when defending against causation claims in personal injury cases.
This article is part of our ongoing 5102(d) issues coverage, with 255 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.
Understanding Causation Defenses in Personal Injury Cases
In New York personal injury litigation, defendants often attempt to escape liability by arguing that a plaintiff’s injuries weren’t caused by the accident in question. These causation defenses typically rely on medical expert testimony suggesting that the plaintiff’s condition stems from pre-existing degenerative changes rather than acute trauma from the incident. However, the strength of such defenses can hinge on seemingly minor details about what evidence was actually examined.
The McDuffie v Rodriguez case from the First Department illustrates an important subtlety that personal injury attorneys must carefully consider when evaluating causation challenges. This decision demonstrates how the thoroughness of a defendant’s medical examination can determine whether their causation defense succeeds or fails.
Jason Tenenbaum’s Analysis:
McDuffie v Rodriguez, 2010 NY Slip Op 03366 (1st Dept. 2010)
“Defendants met their prima facie burden of establishing that plaintiff did not sustain a serious injury by submitting the affirmed reports of experts who, after examining plaintiff and reviewing her medical records and MRI studies, found a lack of causation between her complaint of right knee pain and the subsequent arthroscopic surgical repair and the accident, and instead attributed plaintiff’s condition to pre-existing degenerative osteoarthritis (see Jean v Kabaya, 63 AD3d 509 ). In opposition, plaintiff raised a triable issue of fact, as her treating physician noted acute injuries related to the automobile accident as well as degenerative changes. Defendants’ remaining arguments need not be addressed.”
What was not reviewed? The MRI FILMS.
Why does this matter? Well, what is the standard to defeat to a causation defense based upon a radiologist’s review of the films finding that the condition is degenerative?
I will tell you this much: it is more than some “hysician not acute injuries related to the automobile accident….”
Key Takeaway
The distinction between reviewing MRI studies versus examining actual MRI films can be crucial in causation defense cases. When defendants’ experts only review written reports rather than the underlying imaging, it may create an opening for plaintiffs to successfully challenge the causation defense, even with relatively modest contrary evidence from treating physicians.
This case connects to broader themes in New York no-fault litigation, where breaking the chain of causation remains a viable defense strategy, but only when properly executed with comprehensive medical review.
Legal Update (February 2026): Since this post’s publication in 2010, New York’s Insurance Regulation 68 has undergone multiple amendments that may affect no-fault coverage determinations and causation analyses in personal injury cases. Additionally, appellate courts have continued to refine the standards for medical expert testimony regarding causation defenses, and the fee schedules governing medical examinations have been updated several times. Practitioners should verify current regulatory provisions and recent case law developments when evaluating causation challenges in personal injury litigation.
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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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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.
What are common coverage defenses in no-fault insurance?
Common coverage defenses include policy voidance due to material misrepresentation on the insurance application, lapse in coverage, the vehicle not being covered under the policy, staged accident allegations, and the applicability of policy exclusions. Coverage issues are often treated as conditions precedent, meaning the insurer bears the burden of proving the defense. Unlike medical necessity denials, coverage defenses go to whether any benefits are owed at all.
What happens if there's no valid insurance policy at the time of the accident?
If there is no valid no-fault policy covering the vehicle, the injured person can file a claim with MVAIC (Motor Vehicle Accident Indemnification Corporation), which serves as a safety net for people injured in accidents involving uninsured vehicles. MVAIC provides the same basic economic loss benefits as a standard no-fault policy, but the application process has strict requirements and deadlines.
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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.
If you need legal help with a 5102(d) issues matter, contact our office at (516) 750-0595 for a free consultation. We serve clients throughout Long Island (Huntington, Babylon, Islip, Brookhaven, Smithtown, Riverhead, Southampton, East Hampton), Nassau County (Hempstead, Garden City, Mineola, Great Neck, Manhasset, Freeport, Long Beach, Rockville Centre, Valley Stream, Westbury, Hicksville, Massapequa), Suffolk County (Hauppauge, Deer Park, Bay Shore, Central Islip, Patchogue, Brentwood), Queens, Brooklyn, Manhattan, the Bronx, Staten Island, and Westchester County. Prior results do not guarantee a similar outcome.