Fig. 6-17 The elbow. A, The elbow of a child. Note the epiphysis for the capitulum and the lateral part of the trochlea of the humerus. The ulna is at left. B, The elbow of a child. Note the additional epiphyses for the medial epicondyle of the humerus and the head of the radius. C, The elbow of a child, oblique view, showing epiphyses for the capitulum, lateral part of the trochlea, and medial epicondyle. D, The epiphysis for the upper end of the ulna. Note also the epiphysis for the head of the radius. E, A radiograph of the dried bones of a 5-year-old boy. Note the outline of the cartilage. F, The flexed elbow of an adult. Note the medial epicondyle (arrow on left) and the joint line between the olecranon and the trochlea (arrow on right). (A, B, and C, Courtesy of S. F. Thomas, M.D., Palo Alto Medical Clinic, Palo Alto, California. D, Courtesy of G. L. Sackett, M.D., Painesville, Ohio. F, Courtesy of V. C. Johnson, M.D., Detroit, Michigan.) Click for high resolution image.