A Small Piece of Hardware
Between a Child and a Crash.

In August 2013, six-year-old Ethan Woodruff was riding in a forward-facing booster seat in the back of the family car when a drug-impaired driver crossed into their path near Knoxville in a head-on collision. Ethan’s father, Benjamin Woodruff, was killed. Ethan survived, but with injuries his family says left him permanently and profoundly disabled. According to the pleadings described by the courts, Ethan’s booster seat had been secured to the vehicle’s belt system using a seat belt extender — a strap-and-buckle accessory made to give an adult a few extra inches of belt.

Neither the extender nor the booster seat was claimed to be broken. The family’s theory was quieter and, in many ways, more unsettling: each product was reasonably safe on its own, but using them together created a hidden danger, and the manufacturers failed to warn parents not to combine them. On July 21, 2026, in Woodruff ex rel. Woodruff v. Ford Motor Company, the Tennessee Supreme Court agreed the family should get to make that argument, reversing a lower court that had thrown the failure-to-warn claims out. The decision does not declare anyone liable. What it does is keep alive a claim that most people never realize exists — and it puts a spotlight on a car-seat mistake that is far more common than parents think.

Is it safe to use a seat belt extender with a child’s booster seat?

No. A seat belt extender should be used only when an adult genuinely cannot buckle the standard belt, and only if it comes from the vehicle’s own manufacturer — not as a way to install a child restraint. The National Highway Traffic Safety Administration’s guidance is that a car seat or booster must be installed using the vehicle’s seat belt or the lower anchors, following the car-seat instructions and the vehicle owner’s manual exactly. Adding an extender into that path is outside what either the car seat or the belt system was designed and tested to do.

The reason is geometry. A child restraint only works if the belt holds it tightly in the right place, so that in a crash the seat — and the child in it — stays put and the forces are spread across the strongest parts of the body. An extender adds length and a second buckle to that path. It can let the belt sit higher and looser, allow the restraint to shift or rotate, and change the angle at which the belt pulls in a collision. Vehicle and car-seat makers, and safety technicians who install these seats for a living, warn against introducing any aftermarket product — extenders, tightening clips, strap pads — that the seat was not tested with. A restraint that is even slightly out of position when a crash begins is a restraint that may not do its job in the fraction of a second that matters.

What did the Tennessee Supreme Court actually decide?

The Court decided a narrow but important legal question: whether the Woodruff family’s failure-to-warn claims had to be dismissed before trial. The trial court had let the claims move forward. The Court of Appeals reversed, reading an earlier Tennessee decision — Coffman v. Armstrong International, Inc. — to mean that a manufacturer never has a duty to warn about dangers that arise when its product is combined with someone else’s product. On that reading, because the danger came from pairing Ford’s extender with Dorel’s booster seat, no one had a duty to warn.

The Tennessee Supreme Court rejected that broad reading. It held that Coffman did not require dismissal of the Woodruff claims and that the Court of Appeals had interpreted Coffman too broadly as prohibiting all claims involving a combination of products. The Woodruff facts, the Court found, were distinguishable. The practical result is that the failure-to-warn claims go back to the lower court to be litigated on their merits. It is critical to be precise about what this ruling is and is not: the Court did not find that Ford, Dorel, or anyone else is liable, and it did not decide that the extender caused Ethan’s injuries. It decided only that the family is entitled to try to prove those things rather than being shut out at the courthouse door.

What is a “failure to warn” claim — and how is it different from a defect?

Product-liability law recognizes more than one way a product can be legally “defective.” A design-defect claim says the product was engineered in an unreasonably dangerous way — the theory behind most vehicle cases, including the enhanced-injury claims we describe in our explainer on the crashworthiness doctrine and the second collision. A manufacturing-defect claim says a particular unit came off the line flawed. A failure-to-warn claim — also called a marketing or warnings defect — is different from both. It says the physical product may be fine, but the manufacturer made it unreasonably dangerous by not giving an adequate warning or instruction about a foreseeable risk of using it.

That distinction is why the Woodruff case matters beyond Tennessee. A parent inspecting a seat belt extender would see nothing wrong with it, because there is nothing wrong with it as an adult accessory. The alleged wrong is informational: that a manufacturer who could foresee parents reaching for an extender to make a child seat fit had a responsibility to say, clearly, “do not use this to secure a child restraint.” Whether that duty existed and was breached here is exactly what the trial court will now examine. The Restatement (Third) of Torts: Products Liability § 2(c) frames the general principle: a product is defective when foreseeable risks of harm could have been reduced by reasonable instructions or warnings, and their omission renders the product not reasonably safe.

When does a maker have to warn about combining products?

This is the legal fault line the Tennessee Supreme Court was policing. Courts across the country generally agree that a manufacturer is not an insurer of every other company’s product, and does not have to warn about hazards created entirely by a different maker’s separate item. That is the sensible core of a rule like Coffman. But there is a meaningful difference between “you must warn about someone else’s product” and “you must warn about a foreseeable dangerous use of your own product.” The Woodruff Court’s refusal to read Coffman as a blanket bar on all combination cases keeps that second, narrower duty on the table — the duty to warn about how your own product behaves when it is used in a foreseeable, if unintended, way.

For families, the takeaway is not a technical rule of Tennessee law. It is that liability in a crash rarely stops at the driver who caused it. Just as a negligently hired trucking carrier can bring in the freight broker behind it, a child’s catastrophic injury can raise questions about the restraint system, the vehicle, and the warnings that surrounded them. Identifying every party whose choices contributed to a preventable injury is the same instinct we bring to our work across every accident type — and it is why the first questions in these cases are often not “who hit whom” but “what was the child sitting in, and how was it installed.”

The medical-legal read on a child restraint injury

A restraint case is won or lost on a question that is medical before it is legal: what forces reached the child’s body, and where. That is the work of Herb Borroto, M.D., J.D., the firm’s medical-legal expert. A belt that rides up off the pelvis onto a child’s soft abdomen can produce a recognized pattern of internal injuries — the “seat belt sign,” bowel and mesenteric injuries, and in the worst cases a flexion-distraction spinal injury — that looks different from the injuries a properly positioned restraint tends to allow. Reading the imaging, characterizing the injury pattern, and asking whether it is consistent with a restraint that let the child move out of position is a clinical judgment, not a legal one, and it is the hinge on which a warnings case turns.

On the legal side, Alex Alvarez, Managing Partner and Board Certified Civil Trial Lawyer, frames that medicine inside product-liability law: the difference between a design claim and a warnings claim, the foreseeability of the use, and the standard a warning has to meet to be adequate. Paired, the two answer the defense’s usual argument — that a violent crash would have hurt the child no matter what — with a specific account of what the restraint did, what a proper warning would have changed, and how the injury pattern lines up with the mechanism. That is the same evidence-first approach the firm brings to the traumatic brain injury and spinal cord injury cases these crashes so often produce.

What this means for parents and injured families

There are two lessons in the Woodruff case, and they point in the same direction. The first is preventive: if you are using a seat belt extender, a tightening clip, or any accessory the manufacturer did not test to secure a child’s car seat or booster, stop. Install the seat with the vehicle’s own belt or lower anchors exactly as the car-seat and vehicle manuals direct, keep children in a booster until the adult belt truly fits, and keep children under 13 in the back seat — the everyday steps NHTSA has long recommended. A free car-seat inspection by a certified technician can catch a dangerous installation in minutes.

The second is legal, and it matters after a crash has already happened. When a child is catastrophically hurt, the restraint hardware, the car seat, and the vehicle are evidence — and like all crash evidence, they can vanish when a car is repaired, salvaged, or released. Preserving them, and preserving the medical imaging read against the mechanism of injury, is what allows anyone to reconstruct later what actually happened. We describe that race against time in our guide to the first 24 hours after a crash, and the data behind it in what an event data recorder shows. This article is general information about a category of injury claim and about child-passenger safety, not legal or medical advice about any particular case. Past results do not guarantee similar outcomes, and every case is evaluated on its own facts.