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Junk science?
Causation

Junk science?

By Jason Tenenbaum 8 min read

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.


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

Common Questions

Frequently Asked Questions

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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Attorney Jason Tenenbaum

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.

24+ years in practice 1,000+ appeals written 100K+ no-fault cases $100M+ recovered

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 causation 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.

Filed under: Causation
Jason Tenenbaum, Personal Injury Attorney serving Long Island, Nassau County and Suffolk County

About the Author

Jason Tenenbaum

Jason Tenenbaum is a personal injury attorney serving Long Island, Nassau & Suffolk Counties, and New York City. Admitted to practice in NY, NJ, FL, TX, GA, MI, and Federal courts, Jason is one of the few attorneys who writes his own appeals and tries his own cases. Since 2002, he has authored over 2,353 articles on no-fault insurance law, personal injury, and employment law — a resource other attorneys rely on to stay current on New York appellate decisions.

Education
Syracuse University College of Law
Experience
24+ Years
Articles
2,353+ Published
Licensed In
7 States + Federal

Discussion

Comments (2)

Archived from the original blog discussion.

VP
Vector Prime
Maybe not junk science, but awful application of applicable scientific principles. Failing to calculate the force exerted implies that the relevant vectors were not established, and without all relevant vectors, delta-v couldn’t be established even if the crash test itself were somehow sufficiently analogous. And when four vehicles are involved, with different velocities and directions of travel, you can’t even remotely try to use the simplistic inelastic formula [where vehicle 1’s momentum is m1v1, vehicle 2 is m2v2, so combined momentum is ~v (i.e. m1v1 + m2v2 / m1 + m2); vehicle 1’s delta-v would then be ~v minus v2)]. That’s not to say it can’t be done, of course, but the math is more complicated and time-consuming.
J
jtlawadmin Author
“The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.” I am disappointed that this case was appealed. Your analysis is spot on

Legal Resources

Understanding New York Causation Law

New York has a unique legal landscape that affects how causation cases are litigated and resolved. The state's court system includes the Civil Court (for claims up to $25,000), the Supreme Court (the primary trial court for unlimited jurisdiction), the Appellate Term (which hears appeals from lower courts), the Appellate Division (divided into four Departments, with the Second Department covering Long Island, Brooklyn, Queens, Staten Island, and several upstate counties), and the Court of Appeals (the state's highest court). Each court has its own procedural requirements, local rules, and case-assignment practices that can significantly impact the outcome of your case.

For causation matters on Long Island, cases are typically filed in Nassau County Supreme Court (at the courthouse in Mineola) or Suffolk County Supreme Court (in Riverhead). No-fault arbitrations are heard through the American Arbitration Association, which assigns arbitrators throughout the metropolitan area. Workers' compensation claims go to the Workers' Compensation Board, with hearings at district offices across the state. Understanding which forum is appropriate for your case — and the specific procedural rules that apply — is essential for a successful outcome.

The procedural landscape in New York also includes important timing requirements that can affect your case. Most civil actions are subject to statutes of limitations ranging from one year (for intentional torts and claims against municipalities) to six years (for contract actions). Personal injury cases generally have a three-year deadline under CPLR 214(5), while medical malpractice claims must be filed within two and a half years under CPLR 214-a. No-fault insurance claims have their own regulatory deadlines, including 30-day filing requirements for applications and 45-day deadlines for provider claims. Understanding and complying with these deadlines is critical — missing a filing deadline can permanently bar your claim, regardless of how strong your case may be on the merits.

Attorney Jason Tenenbaum regularly practices in all of these venues. His office at 326 Walt Whitman Road, Suite C, Huntington Station, NY 11746, is centrally located on Long Island, providing convenient access to courts and offices throughout Nassau County, Suffolk County, and New York City. Whether you need representation in a no-fault arbitration, a personal injury trial, an employment discrimination hearing, or an appeal to the Appellate Division, the Law Office of Jason Tenenbaum, P.C. brings $24+ years of real courtroom experience to your case. If you have questions about the legal issues discussed in this article, call (516) 750-0595 for a free, no-obligation consultation.

New York's substantive law also presents distinct challenges. In motor vehicle cases, the no-fault system under Insurance Law Article 51 provides first-party benefits regardless of fault, but limits the right to sue for non-economic damages unless the plaintiff establishes a "serious injury" under one of nine statutory categories. This threshold — codified at Insurance Law Section 5102(d) — requires medical evidence showing more than a minor or subjective injury, and courts have developed detailed standards for each category. Fractures must be documented through imaging studies. Claims of permanent consequential limitation or significant limitation of use require quantified range-of-motion testing with comparison to norms. The 90/180-day category demands proof that the plaintiff was unable to perform substantially all of their usual daily activities for at least 90 of the 180 days following the accident.

In employment discrimination cases, the legal standards vary depending on whether the claim arises under state or local law. The New York State Human Rights Law employs a burden-shifting framework: the plaintiff must first establish a prima facie case by showing membership in a protected class, qualification for the position, an adverse employment action, and circumstances giving rise to an inference of discrimination. The burden then shifts to the employer to articulate a legitimate, non-discriminatory reason for its decision. If the employer meets this burden, the plaintiff must demonstrate that the stated reason is pretextual. The New York City Human Rights Law, by contrast, applies a broader standard, asking whether the plaintiff was treated less well than other employees because of a protected characteristic.

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