When is expert testimony required to prove causation in medical malpractice cases? Morgan v. IHC Explained

Medical malpractice cases generally require expert testimony to establish causation, but Utah courts recognize a limited “common knowledge” exception. The Utah Court of Appeals’ decision in Morgan v. IHC illustrates when this exception does not apply, even where the allegedly negligent act appears straightforward.

Background and Facts

Midge Morgan underwent back surgery at an IHC hospital in February 2003. The morning after surgery, she could not feel or move her right leg and requested a bedpan. A nurse allegedly refused and proceeded to grab Morgan’s arms and jerk her forward to force her out of bed, causing Morgan to scream in pain. Morgan later discovered she had rotator cuff tears in both shoulders requiring surgery. However, Morgan had a significant history of shoulder problems dating to 1970, including bilateral arm pain and numbness following a 1998 car accident. Morgan sued for medical malpractice but did not designate an expert witness.

Key Legal Issues

The central issue was whether Morgan could establish proximate cause without expert testimony under the “common knowledge” exception. IHC argued that expert testimony was necessary given Morgan’s pre-existing shoulder injuries and the complexity of determining what caused her rotator cuff tears.

Court’s Analysis and Holding

The court affirmed summary judgment for IHC. While the common knowledge exception can excuse the lack of expert testimony “when the causal connection is readily apparent using only common knowledge,” this exception applies only in “the most obvious cases.” Here, multiple factors prevented application of the exception: (1) the rotator cuff is an “internal and thus invisible part of the human body unfamiliar to many, perhaps most, jurors”; (2) Morgan’s extensive history of neck, back, and shoulder problems complicated the causation analysis; and (3) even Morgan’s treating physician could only say it was “possible” the incident caused her injuries, which is insufficient to establish causation.

Practice Implications

This decision emphasizes that medical malpractice plaintiffs must carefully evaluate whether their case truly falls within the narrow common knowledge exception. Cases involving internal injuries, complex anatomy, or pre-existing conditions will almost certainly require expert testimony on causation. Practitioners should designate qualified medical experts early and ensure they can provide opinions with the requisite degree of medical certainty rather than mere possibility.