Currently, extracorporeal shockwave therapy (ESWT) is widely used for treatment of various musculoskeletal disorders. We report a case of ulnar neuropathy secondary to the application of ESWT. A 48-year-old man was diagnosed with medial epicondylitis and underwent 2 sessions of ESWT. Immediately after the second session, he experienced paresthesia and weakness in the right hand. On physical examination, atrophy of the first dorsal interosseus and weakness of the abductor digiti minimi were observed. Electrophysiologic study demonstrated ulnar neuropathy at the elbow with severe partial axonotmesis. Our case report demonstrates that ESWT might cause or contribute to peripheral nerve injury at the site of application.
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