[Arthroscopic image of wrist joint instability].

In a consecutive series of 107 arthroscopies, 88 wrists showed a ligamentous lesion on the ulnar side. The TFCC was affected in 90% (79 patients), the triquetrum in 53% (47 patients), the ulnocarpal ligaments in 22% (19 patients) and the hamate in 17% (15 patients). The number of ligament injuries averaged three per wrist. Surprisingly, there were multiple lacerations noted in 22% of the TFCC and these occurred in characteristic combinations.