Biomechanical Properties of Interosseous Proximal Carpal Row Ligaments

The Scapholunate (S-L) and Lunotriquetrum (L-Tr) ligaments have been extensively studied in the literature. A wide range of measurements has been reported for ultimate load and stiffness with different mechanical protocols. In this study, we examined the mechanical properties of both ligaments harvested from the same wrist. Fifteen fresh cadaver wrists were used to harvest eight S-L and four L-Tr. Testing was performed in quasi-static loading in a well defined direction for each ligament system. The ultimate load for S-L was 68-210 N with a mean value of 147 +/- 54 N and a stiffness of 35.7 +/- 9.6 N/mm. For L-Tr the ultimate load was 122-179 N with a mean value of 150 +/- 24 N and a stiffness of 192 +/- 60 N/mm. The two ligaments had nearly the same ultimate load, but the L-Tr had a higher stiffness (p = 0.05). These findings could be useful to assess the appropriate autologous autografts for reconstruction of the S-L and L-Tr. (C) 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 29:668-671, 2011