This is a cadaveric study in which 14 fresh frozen cadavers were used to create a model for posterolateral rotatory instability. In 7 specimens, the authors performed anterior radial collateral ligament sectioning followed by posterolateral collateral ligament sectioning. The contralateral limb underwent posterolateral collateral ligament sectioning followed by anterior radial collateral ligament sectioning. Finally after each ligament was sectioned, the overlying musculature was sectioned as well.
In summary, the authors found that as long as the radial collateral ligament or the lateral collateral ligament was intact, minimal instability was noted. Once both ligaments were transected, a greater degree of instability was noted however, complete instability only occurred once the overlying musculature was transected. This study supports the concept of a lateral ligamentous complex of the elbow, with ligament, tendinous and muscular contributions to stability.
Journal of Shoulder and Elbow Surgery