Anomalous Triceps Muscle Slip as an Unusual Cause of Ulnar Nerve Entrapment in a Division I Baseball Pitcher: A Case Report.

JBJS Case ConnectNov 5, 2026 (epub)
Case ReportOrthopedic Surgery

Josh W Thibeault, Andrew S Cuthbert, Jacob Wait et al.

✦ AI-curated · Sources linked

Case in brief

A 19-year-old right-hand-dominant collegiate pitcher developed medial elbow pain, reduced pitching velocity, and ulnar-sided numbness after a bullpen session. MRI showed a partial ulnar collateral ligament tear, while electromyography was unremarkable. Symptoms persisted despite conservative management. At surgery, an anomalous triceps slip was found overlying the ulnar nerve; it was excised, and the nerve was transposed anteriorly alongside UCL repair. He returned to pitching at 7 months, completed a full season, and remained asymptomatic at 12 months.

What made this case unusual

The ulnar nerve compression was associated with an anomalous triceps slip despite unremarkable electromyography, while MRI also showed a partial UCL tear.

Diagnostic / clinical pearl

In a throwing athlete with ulnar-sided symptoms, unremarkable electromyography does not exclude a surgically identifiable structural cause of nerve compression.

Source

PubMed · PMID 42987233

Published in JBJS Case Connect. This summary was written by xxcode from the publication's abstract and metadata. It is not peer reviewed and is not a substitute for the original article. For clinical decisions, review the original publication.

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