Key Takeaway
Court case analyzing biomechanical expert testimony and causation standards in New York personal injury law, focusing on delta-v calculations and serious injury thresholds.
This article is part of our ongoing causation coverage, with 51 published articles analyzing causation 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.
Imran v R. Barany Monuments, Inc., 2018 NY Slip Op 08921 (2d Dept. 2018)
(1) “On June 5, 2015, the matter proceeded to a jury trial on the issue of damages against the defendants. During that trial, the defendants presented the testimony of a biomechanical engineering expert, Joseph McGowan. McGowan testified regarding delta-v, which is the change in velocity of a vehicle during a collision. Relying on certain photographs of the vehicle occupied by the plaintiff, a Honda CR-V, and the second front-most vehicle, a Ford Focus, which struck the Honda CR-V, damage repair estimates for both vehicles, and a crash test involving a Honda CR-V, McGowan concluded that the delta-v for the collision between the two vehicles was 5.7 miles per hour. He then utilized different crash tests to determine what happens to occupants in crashes with a similar delta-v. He concluded that the impact from the second front-most vehicle to the vehicle occupied by the plaintiff would not have caused the plaintiff’s alleged injuries to the lumbar region of her spine or her knees.
(2) Thereafter, the jury returned a verdict in favor of the defendants on the issue of damages, finding that the plaintiff did not sustain a serious injury under either the permanent consequential limitation of use or significant limitation of use categories of Insurance Law § 5102(d) [*2]as a result of the accident. Subsequently, the plaintiff moved pursuant to CPLR 4404(a) to set aside the jury verdict on the issue of damages in the interest of justice and for a new trial, arguing, inter alia, that McGowan’s testimony on causation should have been precluded. The Supreme Court granted the motion, and the defendants appeal.
(3) Under the circumstances of this case, we agree with the Supreme Court’s determination to grant the plaintiff’s motion pursuant to CPLR 4404(a) to set aside the jury verdict on the issue of damages (see Dovberg v Lauback, 154 AD3d 810). “An expert’s opinion must be based on facts in the record or personally known to the witness’” (Pascocello v Jibone, 161 AD3d 516, 516, quoting Hambsch v New York City Tr. Auth., 63 NY2d 723, 725). Here, a proper foundation was lacking for the admission of McGowan’s opinion (see Parker v Mobil Oil Corp., 7 NY3d 434, 447). Among other things, McGowan failed to calculate the force exerted by all four vehicles, the crash test he utilized to determine the delta-v differed in several significant respects from the instant accident, and he reviewed simulations in which the weight of the dummies was not similar to that of the plaintiff.
Biomechanical engineers are dangerous because, as seen above, they can use alternative facts to come to conclusions that spell disaster on causation claims. I have to give the trial judge credit for reflecting after the proverbial “**** storm” hit and setting aside the verdict. It was a brave move on his part. Not a good case to appeal for the carrier, and definitely the first real push back we have seem from the Appellate Division in a long time on this issue.
Related Articles
- Understanding causal relationship requirements in New York personal injury cases
- How to prove causation in New York accident cases
- Meeting the 5102(d) causation standards in personal injury claims
- Medical expert opinion requirements for establishing causation
- Personal Injury
Legal Update (February 2026): Since this 2018 post, New York courts have continued to develop jurisprudence regarding biomechanical expert testimony and delta-v evidence in no-fault cases, and Insurance Law § 5102(d) serious injury threshold determinations may reflect evolving judicial interpretations. Practitioners should verify current case law standards for admissibility of biomechanical engineering testimony and any updates to serious injury threshold analysis under Insurance Law § 5102.
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.
About This Topic
Causation in New York Personal Injury & No-Fault Law
Causation — proving that the defendant's negligence or the accident caused the plaintiff's injuries — is an essential element of every personal injury and no-fault claim. New York courts distinguish between proximate cause, intervening causes, and pre-existing conditions that may have been aggravated by an accident. The legal standards for establishing causation through medical evidence and the defenses available to challenge causal connection are analyzed in depth across these articles.
51 published articles in Causation
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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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