Figure 3: Frontal radiograph of a patient with Sprengel's deformity (Rigault grade III). (X - Line drawn perpendicular to the body axis 'A'; Y - Line joining the superior and inferior edges of the glenoid; O - Angle between lines X and Y; b: distance between the inferior angle of the normal scapula and the spine; b' - Distance between the inferior angle of the affected scapula and the spine; a - The distance between the superior angle of the normal scapula and the spine; a' - Distance between the superior angle of the affected scapula and the spine