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Guidance on how to defeat a lack of causation motion regarding injury to a knee
Causation

Guidance on how to defeat a lack of causation motion regarding injury to a knee

By Jason Tenenbaum 2 min read

Key Takeaway

Malloy reinstated a right-knee injury claim based on supported medical opinions. Read the 2010 causation ruling and its limits for no-fault practice.

This article is part of our ongoing causation coverage, with 178 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.

The right-knee claim survived in Malloy v Matute, 79 AD3d 584 (2010). The First Department reinstated that part of the personal-injury action after finding a factual dispute over causation; it otherwise affirmed the order.

Legal Update (September 2026): Chapter 58 of 2026, Part EE §§ 1 and 4 removed the 90/180-day serious-injury category for actions and proceedings commenced on or after May 26, 2026; the historical decision discussed here predates that amendment.

Last reviewed: September 2026.

Why the knee evidence was enough for a trial

The defense experts described degeneration. The plaintiff’s physicians connected the knee injuries to the collision through their examinations, MRI results and the conditions requiring surgery. The court also considered the plaintiff’s age, the impact on his right side, the absence of prior right-knee problems and surgery within four months of the accident.

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Surgery alone did not establish causation, and the physicians’ phrase “sole competent producing cause” was not announced as mandatory wording for every expert. Their medical explanation created a triable issue; it did not establish the plaintiff’s entitlement to damages.

Jason’s original introduction below drew an analogy to no-fault practice. Malloy decided a tort serious-injury motion. It did not decide a provider’s entitlement to reimbursement or require every no-fault case to follow the same proof sequence.

Jason’s original 2010 commentary

Jason’s December 2010 introduction is preserved below. Its no-fault comparison and prediction of a defense motion are advocacy observations; the verified holding concerns the right-knee tort claim.

With the uptick in surgeries that are taking place in no-fault practice, the question that every claims representative or defense attorney evaluating these types of cases needs to ask is: “was this injury causally related to the accident?”

As a Plaintiff’s attorney, the question you need to ask, in response to this, is how do you at least raise a triable issue of fact when faced with what should be the inevitable summary judgment motion from the defense attorney.

This is a case from the First Department, where in my opinion, they lay out how a plaintiff needs to address this type of defense.

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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.

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.

178 published articles in Causation

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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

Reviewed & Verified By

Jason Tenenbaum, Esq.

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
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24+ Years
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2,353+ Published
Licensed In
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Discussion

Comments (14)

Archived from the original blog discussion.

S
slick
in no-fault, the burden is less because aggravation of an existing injury is sufficient to establish causation. As a result, a surgeon can also argue that, even if there was degeneration of the joint at issue, the covered incident caused additional symptoms such as pain that required surgery to be treated.
J
JT Author
The burden on the defendant in the summary judgment postulate is the same – I think – whether it be a no-fault or a 5102(d) case. Lack of causation should never differ. I also am not sure subjective symptoms of pain, in the no-fault context, are sufficient to a constitute an aggravation to impose coverage upon an otherwise non-covered event.
RZ
raymond zuppa
Maybe this comment is off. Maybe things are bit more complex but I don’t think so. There is still an egg shell plaintiff rule in NY. For e.g. the knee sucks. Its all messed up. The guy played football and did MMA with plenty of knee locks. But he’s getting around fine. Bam the accident. And everything that was about to give — well it gives. We measure causation from the give for all purposes. What did he lose because of the accident.
S
slick
The causation defense is much more powerful to defeat a personal injury claim. In a personal injury claim, an “eggshell plaintiff” would be entitled to only minimal damages if an accident cracks the eggshell. In a no-fault context, the surgery to repair the shell would be 100% covered no matter how fragile the patient was at the time of the accident. Under Stephen Fealy, M.D., P.C. v. State Farm Mut. Auto Ins. Co., complaints of pain after the accident are sufficient to defeat summary judgment. If a patient reports that before the accident, the joint in question was functional. However, after the accident there is pain and difficulties with range of motion, walking, etc. Unless there is an exam prior to the accident, there is no way for an insurer to refute the claim that the symptoms were caused by the accident as opposed to any prior conditions.
J
JT Author
It is no different in BI. The thing about BI is that there are two (2) inquiries. The first involves causal relationship. The second involves whether the exacerbation is a serious injury. In no-fault, you only deal with the first. As to Fealy, you need to see the record on appeal before you make the conclusions you did. The Court held that the hospital records and complaints of pain coupled with a garbage affidavit were sufficient to defeat a causal relationship motion. It also was the first of what might be many cases on the topic, and who knows where subsequent cases will go. I would be curious to see where the Appellate Division would go with this issue.
RZ
Raymond Zuppa
J.T. you nailed it. That’s why it seems easier in No Fault because there is no serious injury requirement. The guy’s knee is about to fall apart but he’s walking. Bam the accident and now he needs a knee replacement and will always walk with a cane. Defendant has to pay for PI damages from knee replacement through loss of movement — I can no longer do MMA; have sex; etc. That’s the Egg Shell Plaintiff rule. No?
J
JT Author
You are out of your mind Ray. You are correct. My only question is that if the guy had an asymptomatic bum knee, why the heck would he be doing MMA and risk the need for a total knee replacement, irrespective of whether he is involved in a motor vehicle accident.
S
slick
the reason he’s doing MMA is because he’s asymptomatic. He doesnt know about any problems until it affects his life.
J
JT Author
Honestly, I have trouble believing that. There has to be some clue that something is amiss. In the hypothetical world, that is possible. In reality, I have to imagine that most asymptomatic persons were symptomatic prior to attaining asymptomatic status.
RZ
Raymond Zuppa
I simply made the hypothetical in extremis to have my point confirmed — that is all. I have been out of personal injury for a while and was just making sure that the Appellate Term did not get rid of the hornbook with regard to the Egg Shell Plaintiff Rule as they did with just about everything else. That being said it is possible to have an active guy with a bum knee just waiting to totally go. I played D-1 football and I know a bunch. I remember when I first started at the Corp Counsel. I am doing a depo of a guy who’s knee tendon snapped as he went down steps. He claimed there was a defect in the steps. I did a thorough job and found out that the tendon in his other knee snapped while descending steps. “That’s my knees. That’s what they do. I have to live with it.” I thought “Wow I got ’em. He’s predisposed to knee injuries.” And then one of the senior attorneys said “Ray you just got out of law school. Don’t you remember the Egg Shell Plaintiff Rule?” However the above fact pattern does make for some interesting issues. The argument would be that there was no defect or since there was a picture of the defect [the step had a slight incline] — a gutsy lawyer would have argued that your knee tendon snapped on its own; then your lawyer saw the defect and said “let’s blame it on that.” A judge could kill that whole line with one or two sustained objections. Trial tip: Open on it. Explain to the jury that there are two phases to this trial. Negligence/causation and then injury. [explain it] Then the order is important here. Start by saying that in this case there is an injury and there is a defect but the defect did not cause the injury. Continue by saying that slight incline on the steps was an opportunity to make money for the Plaintiff. When the Plaintiff’s knee tendon snapped it just snapped on its own. The plaintiff’s lawyer said “you can’t sue for that” so they decided to blame the incline. Tell the jury you will see that this is true because the evidence will demonstate that the Plaintiff has a condition where his knee tendons just snap when going down stairs. Sounds hard to believe but listen to this. It happened once before. The Plaintiff was simply walking down some stairs and the tendon in his other just snapped by itself. The same exact type of snap. You’ll see that the Plaintiff testified under oath: “That’s my knees. That’s what they do. I have to live with it.” And when it happened here the Plaintiff said “hey time to make some money” — so him and his lawyer blamed the defect so that they could sue. Because you can’t sue if your knee tendon’s just snap by themselves. Judge is hard pressed to sustain an objection to questions about the prior injury once you have presented your theory. Once the jury hears that this guy’s knee tendons snap by themselves they’ll nullify the law.
RZ
Raymond Zuppa
Of course you have to lead off every accusation with “the evidence will demonstrate” so that you don’t get a sustained objection as to the opening being arugmentative. “The evidence will demonstrate that the Plaintiff and his lawyer decided to blame the step because you can’t sue when your knee tendon snaps by itself. You’ll see ….” [Then list the evidence — the other knee snapping; the slight incline of the step; the lawyer is the plaintiff’s friend’s uncle; etc] The summation can be argumentative but not the opening.
S
slick
JT, I think you are confusing reality with proof. Even if he has an inkling, it’s realistic to assume he will report that his injuries and disability are caused by the accident. Further, it is extraordinarily difficult to refute the assertion that the accident caused the injury and symptoms without medical records documenting the condition of the joint prior to the accident. In most circumstances, they dont exist.
J
JT Author
I am not confusing reality with proof. I am cognizant that the evidence viz medical records and other documentary evidence will demonstrate that the patient never had any prior complaints of pain or symptoms prior to the MVA. Yet, the reality is usually otherwise. Yes, go prove it. I understand your point.
RZ
Raymond Zuppa
Wait boys. This debate is starting to miss the point. I don’t care if he had 10 prior surgeries on the damn knee. If the accident injures the knee further then if your the insurance company you are on the hook. Even if it injures the same part of the knee that was surgically repaired. Now it is a matter of degrees. If the subject accident is a 60 mph head on collision it is easy. If it is a low damage 5 mph hit then it might be tougher on the claimant/plaintiff. But under the law if the knee was a basket case. A time bomb. And the five MPH was the straw that broke the camel’s back this time around — even if the camel’s back was going to break anyway; your stuck with it. “Yeah the knee stunk. Major surgeries. But I was getting along with it. It hurt. I limped but I got around. Now I need a four prong walker/cane to even go ten yards and that’s it” Well the insurer is stuck with that if the proof is there. “Patient had prior knee surgeries, etc. Prior injuries aggravated by accident …”

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