Scapholunate Dissociation

Scapholunate dissociation is the most common ligamentous causes of carpal (wrist bone) instability. It is an instability between the scaphoid and lunate bones of the wrist. It typically follows a fall onto an outstretched hand where the wrist is forced into a position of hyperextension (bending beyond the normal range of movement) and ulnar deviation (wrist drifting towards the little finger), which causes a stretching or tearing of the scapholunate interosseous and radioscaphoid ligaments – resulting in wrist instability. Scapholunate dissociation typically presents as pain on the radial (thumb side) or dorsal (back) of the wrist following a fall onto an outstretched hand.

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