The medial epicondyle apophysis is the growth centre at the inner bony bump of the elbow, where the forearm flexor-pronator muscles and the ulnar collateral ligament attach. It appears at about 5-7 years and is usually the last elbow centre to fuse, at about 15-17 years. Until then its growth plate is the weak link, so repeated throwing or a fall can inflame it or pull it off.
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| Ossification | Secondary centre appears at about 5-7 years and is usually the last elbow centre to fuse, at about 15-17 years. |
Medial epicondyle avulsion in children occurs from acute valgus elbow injury or from the chronic repetitive valgus stress of little league elbow. The apophysis may be trapped in the joint (incarcerated) following elbow dislocation, requiring urgent open reduction. The apophyseal ossification centre appears at 5-7 years, before this age the medial epicondyle cannot be avulsed.
Acute avulsion of the medial epicondyle apophysis from valgus injury or elbow dislocation producing medial elbow pain and tenderness in a child or adolescent, requiring surgical fixation when displaced or incarcerated in the joint.
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