Ulnar shortening osteotomy. A, Six-hole 3.5-mm AO plate is placed on dorsal surface of ulna, and two most distal screws are inserted. Longitudinal mark is made with electrocautery for rotational orientation. B, Oscillating saw is used to make oblique osteotomy through 70% of ulna. C, Plate is secured to ulna with dynamic compression technique. SEE TECHNIQUE 69.32.