Radial collateral ligament injuries of thumb

Less common than ulnar collateral ligament injuries (game keepers thumb)
RCL is important in pinch and depression movements
RCL injury leads to static and dynamic instability
Grade 3 tears are usually treated surgically

Review article:
Edelstein DM et al. Radial Collateral Ligament Injuries of the Thumb. The Journal of Hand Surgery. Volume 33, Issue 5, May-June 2008, Pages 760-770