In order to prevent unnecessary manipulation or open reduction, separation of the entire distal humeral epiphysis must be differentiated from dislocation of the elbow and fracture of the lateral condyle of the humerus. The keys are the relationship between the radius and capitellum and the direction of displacement of the radius and ulna, The normal relationship is maintained and the radius and ulna are medially displaced in separation of the distal humeral epiphysis. This relationship is disturbed in two other injuries and the bones of the forearm are laterally displaced in dislocation. Five cases are presented.
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Rogers et al. (1973) studied this question.