Variation in the extensor muscles of the hand is common. These anatomic deviations are rarely symptomatic. We report a unique
case of an anomalous extensor indicis proprius causing a painful snapping wrist. Intraoperative examination revealed a disproportionately
large muscle belly under the extensor retinaculum causing subluxation of the ring and small extensor tendons creating a painful
snapping phenomenon. Following excision, the subluxation and pain resolved.
Keywords Muscle - Anomalous - Pain - Wrist - Snapping Wrist - Tendons - Para-Articular