Additional Tendon Slip of the Extensor Carpi Radialis Longus: A Case Report with Clinical Application

Abstract

Additional tendon slips of the extensor carpi radialis longus are rare anatomical variants, with incidence ranging from 12-35%. While this anatomical variant is typically benign, it is clinically important as it can contribute to neuromusculoskeletal dysfunction. Medical providers should be aware of variations of the wrist extensors during surgeries involving the forearm and wrist. The presence of additional tendons may cause confusion when interpreting imaging findings. This case report details findings of an additional wrist extensor tendon identified during a cadaveric dissection lab in a physical therapist education program.