Unusual Variant of the Extensor Carpi Radialis Brevis Muscle: A Case Report

Hiromichi Mitsuyasu, Ryo Yoshida, Munir Shah, Rita Patterson, Steven F. Viegas

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A variation of the extensor carpi radialis brevis muscle (ECRB) origin was discovered during a cadaveric dissection. The identified ECRB originated from the fascia/tendon of the extensor digitorum communis (EDC), without any of its origin at the usual location on the lateral epicondyle. The ECRB tendon inserted onto the third metacarpal base. A branch of the posterior interosseous nerve innervated the ERCB. This is the first report of an ECRB originating from the EDC fascia/tendon. This unique variation of the ECRB origin may be of clinical interest, especially in the treatment of lateral epicondylitis (tennis elbow).

Original languageEnglish
Pages (from-to)61-63
Number of pages3
JournalClinical Anatomy
Issue number1
StatePublished - 19 Jan 2004


  • Anatomic variation
  • Extensor carpi radialis brevis
  • Tennis elbow


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