Type 1 Medial head of the triceps remains posterior to the medial epicondyle with passive elbow flexion. Type 2 Triceps subluxates onto but not anterior to the medial epicondyle with elbow flexion.

Methods of measuring displacement and the adequacy of a subsequent reduction include measuring Baumann's angle, the humerotrochlear angle, and the medial epicondylar epiphyseal angle (MEE).