Humeral retroversion and shoulder muscle changes in infants with internal rotation contractures following brachial plexus birth palsy

Figure 1 Schematic illustration of measurement parameters applied to a magnetic resonance imaging slice from the proximal part of the normal uninvolved, humerus. (Reproduced with modification from: Pearl ML, et al. Geometry of the proximal humeral articular surface in young children: a study to define normal and analyze the dysplasia due to brachial plexus birth palsy. J Shoulder Elbow Surg 2013; 22: 1274-84. Reproduced with permission from Elsevier.)