Under Tennessee law, the plaintiff in a negligence lawsuit must prove four elements: duty, breach of duty, causation, and damages. If the negligence action sounds in medical malpractice, the plaintiff is required to provide expert testimony as to the standard of care (duty) element. Purportedly, this is to aid the jury in determining complex issues with which they may not be familiar.
A failure to provide expert testimony usually results in the dismissal of a medical malpractice plaintiff’s claim, except in the most obvious of cases (such as a medical instrument left inside the patient’s body).