What constitutes unusual exertion in Utah workers' compensation claims? JBS USA v. Labor Commission Explained

In workers’ compensation cases involving preexisting conditions, Utah requires employees to meet a heightened standard of legal causation. The Utah Court of Appeals recently clarified this standard in JBS USA v. Labor Commission, examining when workplace activities constitute “unusual exertion.”

Background and Facts

Foster, an experienced truck driver with preexisting knee and back conditions, was driving for JBS USA when she detected a burning smell and heard a loud explosion from her semi-truck. Fearing the vehicle would explode, she immediately jumped from the driver’s side door, landing on the ground from approximately 40 inches high. This deviated from her usual three-point exit method. The jump aggravated her preexisting conditions and caused a new left knee injury. JBS challenged the Labor Commission’s award of workers’ compensation benefits.

Key Legal Issues

The case presented two primary issues: whether the Commission’s factual findings were supported by substantial evidence, and whether Foster’s jump constituted unusual exertion under the Allen standard. Under Allen v. Industrial Commission, employees with preexisting conditions must show their employment “contributed something substantial to increase the risk [they] already faced in everyday life.”

Court’s Analysis and Holding

The court first rejected JBS’s factual challenge, noting that JBS failed to marshal all supporting evidence and instead only highlighted contradictory evidence. On the legal causation issue, the court applied the two-step Allen inquiry: characterizing the employment activity considering the totality of circumstances, then determining whether it was objectively unusual. The court distinguished Miera v. Industrial Commission, noting that while Foster’s jump was from a lesser height than in Miera, the exigent circumstances made her single emergency jump unusual compared to planned, repeated activities.

Practice Implications

This decision reinforces that context matters significantly in unusual exertion analysis. Emergency circumstances can elevate otherwise routine activities to unusual exertion. Practitioners challenging Commission findings must marshal all evidence, not just contradictory evidence, to meet their burden on appeal. The decision also clarifies that the focus remains on activities “generally expected of people in today’s society,” not just employment-specific activities.