Authors of section

Authors

Harry Hoyen, Simon Lambert, Joideep Phadnis

Executive Editor

Simon Lambert

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Avulsion of medial epicondyle

Definition

This fracture type is classified by the AO/OTA as 13A1.2.

These fractures represent avulsion of the humeral origin of the medial collateral ligament and common flexor origin, resulting from a valgus force to the elbow.

Avulsion of medial epicondyle

Further characteristics

Medial epicondyle fractures are more common in skeletally immature patients.

Note: Preoperative imaging, including computed tomography, can be used to identify associated articular extension.

Take note to exclude an associated compression fracture of the radial head or the capitellum.

X-ray of avulsion of medial epicondyle

X-ray of avulsion of medial epicondyle

Incarcerated fragment

In rare cases, the fragment is incarcerated in the ulnohumeral joint.

Incarcerated medial epicondylar fragment

AP view of an avulsion of medial epicondyle in an adult with the fragment incarcerated in the ulnohumeral joint

X-ray of incarcerated medial epicondylar fragment

Lateral view of a similar case in a pediatric patient

X-ray of incarcerated medial epicondylar fragment
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