The medial epicondyle is the non-articular bony prominence on the posteromedial distal humerus, providing the common origin for the flexor-pronator muscle group (pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, flexor digitorum superficialis) and the anterior band of the medial collateral ligament. The ulnar nerve passes directly posterior to it in the cubital tunnel.
Medial epicondylitis (golfer's elbow) involves degenerative change at the common flexor origin. The medial epicondyle is the most commonly fractured structure at the elbow in children (lateral condyle is the most common apophyseal injury overall). Avulsion of the medial epicondyle apophysis occurs in adolescent throwers (little leaguer's elbow). The ulnar nerve is decompressed by releasing the cubital tunnel retinaculum at this level.
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