Disruption of the scapholunate interosseous ligament (SLIL) or lunotriquetral interosseous ligament (LTIL) may occur in isolation or as part of a more extensive perilunate wrist dislocation. Both ligaments may be injured to various degrees from partial to complete rupture. At the time of injury, the two carpal bones adjacent to each ligament may shift only minimally despite complete ligament rupture, shift significantly but with immediate spontaneous reduction or the patient may present with a wrist dislocation. The injury may begin at the radial aspect of the wrist and progress in an ulnar direction or vice versa depending on the precise mechanism. When a perilunate dislocation is associated with fracture of the radial styloid or one or more carpal bones, the lesion is referred to as a greater arc injury. When a perilunate dislocation is purely ligamentous, the lesion is referred to as a lesser arc injury. This report details the arthroscopic evaluation and management of the latter.
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