Abnormal carpal morphology Scapholunate ligament tear 2025-03-09T08:44:00Z Scapholunate ligament rupture Together with the lunotriquetral interosseous ligament, the scapholunate ligament is one of the two proximal interosseous carpal ligaments of the wrist. It is a C-shaped ligament that binds the scaphoid bone to the lunate bone of the wrist. A scapholunate tear can be partial or complete. Since it is C-shaped, it often is only one limb of the C that is torn. A breakage (partial or complete tear) of the scapholunate ligament. The most common cause is physical trauma to the wrist such as a fall onto an outstretched hand. Tear of the scapholunate ligament may lead to carpal instability. Scapholunate ligament injury