[Arthroscopic repair for ulnar-sided tears of the TFCC]

Accurately performed anatomic and biomechanical studies as well as clinical experience during the last years have widened our knowledge about function and pathology of the distal radioulnar joint (DRUJ) making a differentiated treatment possible. In cases of trauma a rupture of the ulnar part of the triangular fibrocartilaginous complex (TFCC) frequently occurs. An overview is given on the development of different arthroscopic techniques for repair and the state of the art is presented. The ulnar part of the TFCC is constituted of the superficial part which is less important for stability and the deep part which is anchored to the fovea of the ulnar head. This deep part is the most important stabiliser of the DRUJ. Each of these parts may rupture separately or both of them may rupture at the same time. Keystones for diagnosis are clinical examination and arthroscopy. On clinical examination instability of the DRUJ is to be evaluated by comparing it to the contralateral side. Furthermore, the degree of instability should be estimated. Extraarticular associated lesions must also be assessed clinically. On arthroscopy the TFCC may be evaluated from the radiocarpal joint as well as from its undersurface, from the DRUJ. In cases of avulsion from the fovea, an anatomic reconstruction with reinsertion of the deep part to the bone is indicated and may be performed successfully according to the published studies and our own experience. If a severe instability is found on clinical examination it is to be supposed that more stabilising structures - then only the radioulnar ligaments - are affected and reinsertion of the deep fibres to the fovea may not be sufficient.