Reason: Assess integrity of R thumb UCL History: R thumb pain over UCL, ligament laxity, history of injury 3/2016 The ulnar collateral ligament appears intact. The radial collateral ligament proper can be followed from the first metacarpal head to the base of the proximal phalanx, however, there is increased signal intensity within its dorsal fibers as well as mild edema within the adjacent base of the proximal phalanx. These findings suggest a partial tear of the ligament and perhaps a small avulsion fracture. The collateral ligaments of the interphalangeal joint of the thumb appear normal. The remaining visualized bone and soft tissue structures appear normal.
Abnormal signal intensity within the dorsal fibers of the radial collateral ligament as well as edema within the adjacent base of the first proximal phalanx suggesting a partial-thickness tear and perhaps an avulsion fracture. This could be further evaluated with radiographs. The ulnar collateral ligament appears normal.