Fig. 2

Defining landmarks for radiographic measurement. (a) The proximal landmark for measuring humerus length was set as the highest protruding point of the humeral head. The distal landmark for measuring humerus length was set as the lowermost margin of ossified bone of the lateral condyle. For children or adolescents with incomplete ossification, the landmark for measuring was set as the lowermost ossified margin of the ossification center of the capitellum. (b) The point where the nerve leaves the lateral intermuscular septum into the anterior humerus was designated as the anterior exit point (AE)