Expert testimony is crucial in personal injury trials, helping juries understand an incident’s technical or scientific aspects. However, when experts testify outside the boundaries of their expertise, their opinions risk prejudicing the jury and affecting the case outcome. A recent decision from Florida’s Fifth District Court of Appeal highlights these issues, focusing on the scope of biomechanical expert testimony in personal injury cases. In this case, the appellate court ruled that the trial court improperly allowed a biomechanical engineer to offer medical causation opinions, exceeding the expert’s qualifications and warranting a new trial.
Biomechanical engineers are frequently called upon in personal injury cases to explain the forces involved in an accident and how a hypothetical person might respond to those forces. While their expertise is valuable in understanding mechanics and dynamics, it does not extend to diagnosing or determining the specific cause of an individual’s injuries. The Fifth District’s opinion underscores the importance of maintaining clear boundaries between engineering analysis and medical conclusions in personal injury litigation.
What Biomechanical Experts Can Address
Biomechanical engineers provide insight into how physical forces from an accident interact with the human body. Their analyses often focus on whether the forces involved could generate specific injury mechanisms in a general sense. For example, a biomechanical expert might testify about the likelihood of a particular type of injury occurring given the speed of a collision, the position of a vehicle occupant, or the physical properties of the human body. This type of testimony helps jurors understand the mechanics of the accident without delving into individualized medical conclusions.