Biomechanical evaluation of distal radioulnar reconstructions.

Numerous reconstructive procedures have been described for the treatment of chronic instability of the distal radioulnar joint or instability of the stump of the resected distal ulna. This biomechanical study presents an evaluation of the three basic design types that have been used in reconstruction. The initial static stability provided by the reconstructions was tested and compared with the stability of the intact joint. Our findings show that all reconstructive procedures failed to restore natural joint stability. A radioulnar sling design was the most effective of the three types, whereas tenodesis procedures and ulnar collateral ligament reconstruction were much less effective in providing stability. We conclude that current designs have significant biomechanical shortcomings. On the basis of our observations during testing, we believe that improved designs will require an intra-articular reconstruction that more closely duplicates the biomechanical functions of the triangular fibrocartilage complex.