A Posterior View Of The Dorsal Radial Tubercle On The Radius

Description

Rotating through a posterior view of the distal forearm, the animation centers on the dorsal radial tubercle (Lister’s tubercle) on the distal radius, a bony prominence on the dorsum of the wrist just proximal to the radiocarpal joint line. The tubercle sits between the extensor compartments, with the extensor carpi radialis longus and brevis tendons passing lateral (radial) to it while the extensor pollicis longus tendon courses medial (ulnar) and uses the tubercle as a pulley. Subtle changes in angle clarify how the tubercle relates to the dorsal rim of the distal radius and the adjacent grooves that guide extensor tendons. Small structure, big landmark. Lister’s tubercle matters because it is the consistent dorsal reference point for localizing extensor compartments and for orienting dorsal wrist anatomy in trauma and operative planning. Distal radius fractures and dorsal plating can alter the contour of the tubercle or its grooves, predisposing to extensor pollicis longus tenosynovitis or delayed EPL rupture, a classic complication after Colles-type injuries even when the fracture appears to have healed. Motion in the sequence makes the spatial logic obvious: you see why EPL is vulnerable where it wraps around the tubercle and why hardware prominence or callus at the dorsal distal radius can abrade the tendon. Use this animation in upper limb anatomy and musculoskeletal courses when teaching extensor tendon compartmentalization, in orthopedic or hand surgery education for dorsal approaches to the distal radius, and in radiology teaching files as a surface landmark for correlating with lateral wrist radiographs, CT, and ultrasound of dorsal extensor tendons. Anatomical accuracy verified by SciePro's Medical Advisory Board.