All malpractice claims require an expert witness, except in which of the following cases?

The statement that all malpractice claims require an expert witness, except in the case of amputation of the wrong leg, is grounded in the legal principle of "res ipsa loquitur," which translates to "the thing speaks for itself." In situations where a medical professional commits a glaringly obvious error, such as amputating the wrong leg, the need for expert testimony is not necessary to establish negligence. The circumstances are so egregious that a reasonable person can understand the error without specialized medical knowledge.

In contrast, informed consent disputes, misdiagnosis accusations, and failure to report a condition involve complexities that typically necessitate expert testimony to clarify what constitutes standard care and whether it was breached. These cases often require an expert to help the court understand the nuances of medical practice and how the actions of the healthcare provider deviated from accepted standards, making those claims more dependent on expert witness input.