This condition is an injury to the medial ulnar collateral ligament, a ligament composed of three bands located on the inner side of the elbow. The MUCL connects the humerus to the ulna. Injury to the MUCL can cause pain, weakness and sometimes a feeling of instability in the arm. Severe MUCL injuries may require Tommy John surgery to reconstruct the damaged ligament. This condition is also closely related to cubital tunnel syndrome, as both involve structures on the inner side of the elbow.

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