Can a biomechanical expert testify that the crash forces caused my injury?

· 3 min read

A biomechanical expert may testify about the forces a collision generated and how those forces can act on the human body, but whether such a witness can go further and state that the crash caused a specific medical injury is more limited. Georgia courts handle that line carefully under the reliability rules for expert testimony.

What biomechanics covers

Biomechanics applies engineering and physics to the body. A qualified biomechanical engineer can analyze the direction and magnitude of the forces in a crash and describe, in general terms, the kinds of injury mechanisms those forces are capable of producing. This can help a jury understand whether the dynamics of a collision are consistent or inconsistent with a claimed injury. Defendants sometimes use such testimony to argue that a low-speed impact lacked the force to cause a serious injury, while injured parties may use it to show the forces were sufficient to produce the harm.

The strength of this testimony is its grounding in measurable physical principles. Its limit is that engineering describes forces, not diagnoses. The body’s response to force varies with each person, and the leap from “these forces occurred” to “this person sustained this particular injury” often crosses into medicine.

Where Georgia draws the line

The admissibility of biomechanical testimony is governed by O.C.G.A. § 24-7-702, and the court as gatekeeper looks at both qualifications and method. Two recurring questions arise:

  • Is the witness qualified for the specific opinion? An engineer may be qualified to discuss forces and general injury mechanisms but not to render a medical diagnosis, which usually requires a physician.
  • Is the opinion reliable and a good fit? The method must rest on sound principles applied to the actual facts, and the opinion must not stretch beyond what the analysis supports.

Because of these limits, biomechanical testimony often works best paired with medical evidence. The engineer explains the forces and what they can do; a treating physician or medical expert connects those forces to the actual diagnosis to a reasonable degree of medical certainty. Standing alone, a pure forces opinion may not establish that this specific injury resulted from the crash, and a court may exclude an engineer who tries to give what is effectively a medical causation opinion.

How a particular court treats such testimony depends on the qualifications offered, the method used, and how the opinion is framed, all assessed case by case.

The bottom line

A biomechanical expert in Georgia can generally testify about crash forces and the injury mechanisms those forces may cause, but qualification and reliability limits under O.C.G.A. § 24-7-702 often stop such a witness from rendering a medical diagnosis. The forces analysis usually complements, rather than replaces, a physician’s causation opinion.

This article is for general educational and informational purposes only and is not legal advice. It does not create an attorney-client relationship, and Georgia law may change. For advice about a specific situation, consult a licensed Georgia personal injury attorney.

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