Abstract
Background Degenerative tendinopathy of the extensor carpi ulnaris (ECU) produced by the tip
of an oversized ulnar styloid has not been formerly reported.
Case Description We report an uncommon case of an injury to the ECU tendon that was related to a prominent
oversized ulnar styloid. The patient's symptoms improved following resection of the
styloid process.
Literature Review Our case differs from previous reports in that it involves an uninjured oversized
ulnar styloid that damaged the overlying ECU tendon with no apparent instability.
Clinical Relevance Besides ulnar styloid impaction syndrome, the diagnosis of ECU tenosynovitis should
also be considered in patients with ulnar-side pain and an oversized ulnar styloid.
Keywords
extensor carpi ulnaris - tendinopathy - tenosynovitis - ulnar styloid - wrist ulnar-side
pain
