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Biomechanical Engineer allowed to testify
Causation

Biomechanical Engineer allowed to testify

By Jason Tenenbaum 8 min read

Key Takeaway

Landmark 2014 Vargas v Sabri case allows biomechanical engineers to testify on motor vehicle accident causation without medical credentials in New York courts.

This article is part of our ongoing causation coverage, with 333 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.

Vargas v Sabri, 2014 NY Slip Op 01666 (1st Dept. 2014)

In the world of the use of  bio mechanical engineer issues, this case is actually a watershed case.  Here, the Appellate Division essentially called into question the holding of the Appellate Term 7 years ago in Bronx Radiology, P.C. v New York Cent. Mut. Fire Ins. Co.,17 Misc.3d 97 (App. Term 1st Dept. 2007)(“ccident reconstruction evidence may often prove useful in explaining how an accident occurred, its probative value on issues related to causation is limited unless amplified by a meaningful medical assessment of the claimed injuries”) through holding that a biomechanical expert need not have medical credentials to offer an opinion, within a reasonable degree of engineering certainty, that that motor vehicle accident did not cause the injuries at bar.

The case held as follows:

“The fact that Dr. McRae lacked medical training did not render him unqualified to render an opinion as an expert that the force of the subject motor vehicle accident could not have caused the injuries allegedly sustained (see e.g. Melo v Morm Mgt. Co., 93 AD3d 499, 499-500 ). McRae’s stated education, background, experience, and areas of specialty, rendered him able him to testify as to the mechanics of injury (see Colarossi v C.R. Bard, Inc., 113 AD3d 407 ).

Plaintiffs’ challenge to Dr. McRae’s qualifications and the fact that his opinion conflicted with that of defendant’s orthopedic expert go to the weight and not the admissibility of his testimony (see Williams v Halpern, 25 AD3d 467, 468 ). Plaintiffs’ challenge to the basis for Dr. McRae’s opinion addressed only portions of the evidence relied upon by him. Furthermore, the record shows that plaintiffs improperly attempted to put defendant to his proof [*2]by asserting, in the moving papers, that “defendant has not shown that the hearsay studies’ Mr. McRae relies upon are reliable,” without identifying any of the studies referred to or explaining the basis for the belief that the studies were not reliable.”


Legal Update (February 2026): The admissibility standards for expert testimony, including biomechanical engineering experts, may have evolved since 2014 through subsequent appellate decisions and potentially updated evidentiary rules. Practitioners should verify current judicial standards regarding the qualifications required for biomechanical experts to testify on causation issues in no-fault insurance cases, as the precedential weight of Vargas v Sabri may have been modified by more recent case law.

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.

333 published articles in Causation

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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.

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.

What is policy voidance in no-fault insurance?

Policy voidance occurs when an insurer declares that the insurance policy is void ab initio (from the beginning) due to material misrepresentation on the application — such as listing a false garaging address or failing to disclose drivers. Under Insurance Law §3105, the misrepresentation must be material to the risk assumed by the insurer. If the policy is voided, the insurer has no obligation to pay any claims, though the burden of proving the misrepresentation falls on the insurer.

How does priority of coverage work in New York no-fault?

Under 11 NYCRR §65-3.12, no-fault benefits are paid by the insurer of the vehicle the injured person occupied. For pedestrians and non-occupants, the claim is made against the insurer of the vehicle that struck them. If multiple vehicles are involved, regulations establish a hierarchy of coverage. If no coverage is available, the injured person can apply to MVAIC. These priority rules determine which insurer bears financial responsibility and are frequently litigated.

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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.

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

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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