Dorsal Carpometacarpal Ligaments, Posterior View

Description

Dorsal wrist and proximal hand anatomy is presented from a posterior perspective, centering on the dorsal carpometacarpal ligaments that span from the distal carpal row to the bases of the metacarpals. Short fibrous bands strap the trapezium, trapezoid, capitate, and hamate to metacarpals I through V, crossing the dorsal aspects of the carpometacarpal joints with a clear proximal to distal orientation. The second and third metacarpal bases sit centrally and more rigidly articulated to the trapezoid and capitate, while the fourth and fifth rays align ulnarly with the hamate, reflecting the transition from the stable central pillar to the more mobile ulnar CMC complex. Bony landmarks at the metacarpal bases and dorsal carpal surfaces frame each ligamentous slip. Tight bands, small joints. Posterior visualization of these ligaments matters because dorsal restraint governs dorsal translation and rotational stability at the CMC joints, a frequent focus when explaining why the index and middle metacarpals behave as a stiff unit during power grip. In traumatic CMC fracture dislocations, dorsal displacement of the fourth and fifth metacarpal bases is common, and appreciation of the dorsal ligamentous attachments helps correlate radiographic step-offs on lateral views with the expected pattern of instability. Surgeons working dorsal approaches to the ulnar CMC joints also track these fibers while protecting the extensor carpi ulnaris tendon and the dorsal sensory branches of the ulnar nerve. Hand and upper limb anatomy courses can use this plate to teach the distinction between the rigid central CMC joints and the more mobile ring and small finger CMC articulations, and to anchor exam questions on CMC fracture-dislocation mechanisms. It also fits orthopedic and radiology publications discussing dorsal CMC instability, operative fixation planning, and postoperative ligamentous healing. Anatomical accuracy verified by SciePro's Medical Advisory Board.