Abnormal elbow morphology Elbow lateral collateral ligament tear 2024-12-03T17:26:54Z An injury to the lateral collateral ligament (LCL) of the elbow. The LCL is a complex capsuloligamentous structure critical in stabilizing the ulnohumeral and radiocapitellar articulations. LCL injury can result in elbow instability, allowing the proximal radius and ulna to externally rotate away from the humerus as a supination stress is applied to the forearm. Ligamentous tear on the lateral aspect of the elbow Lateral ulnar collateral ligament tear