Fig. 6-26. The upper and lower ends of the right radius and ulna, showing the usual position of the epiphysial lines and the usual line of attachment of the joint capsule. The epiphysial line of the head of the radius is intracapsular, that of the upper end of the ulna partly or entirely extracapsular, and those of the lower end extracapsular. The additional views of the ulna (upper two figures) show a variation in the position of the epiphysial line. (Modified from Mainland.)Click for high resolution image.