18 year-old male with pain, multiple injuries There is thickening of the common flexor tendon, which likely represents a combination of tendinosis and scarring, with increased signal intensity at its origin which I suspect reflects chronic partial-thickness tearing or a prior full-thickness tear that has subsequently scarred down to the bone. The common flexor tendon is inseparable from the underlying anterior bundle of the ulnar collateral ligament, which we suspect is due to scarring. The majority of the ulnar collateral ligament is separated from the distal humerus suggesting a near full-thickness tear, or perhaps a full-thickness tear with focal scarring to bone. The UCL is also partially separated from the coronoid process, indicating at least a partial thickness tear. The ligament itself appears thickened, likely representing a combination of scarring and degeneration.There are findings indicating chronic injury to the lateral supporting structures of the elbow as well, including thickening of the posterolateral capsule, which is inseparable from the common extensor tendon. This likely represents chronic scarring with heterotopic ossification seen on recent radiographs. The normal bilaminar appearance of the radial collateral ligament and common extensor tendon is not seen, likely due to prior injury and scarring. Anteriorly, the lateral collateral ligament appears thickened. The lateral ulnar collateral ligament is grossly intact. The radial head is slightly laterally subluxed relative to the capitellum. A small amount of fluid is within the lateral joint with a curvilinear structure extending from the capitellum that likely either represents a synovial plica or a fragment of torn ligament.The tendons of the biceps and brachialis appear normal. The triceps tendon appears normal. We see no atrophy or edema of the musculature. There are small osteophytes along the ulnohumeral articulation with mild degeneration of the adjacent articular cartilage, but we see no discrete fluid-filled articular cartilage defect. The bone marrow signal is within normal limits.The ulnar nerve become slightly thickened with increased signal intensity within the proximal cubital tunnel, which may represent a mild neuritis.
Findings compatible with the stated history of multiple prior injuries including chronic tearing/scarring of the medial and lateral supporting structures of the elbow as described above.