Ulnar cut guide alignment system

An ulnar cut guide alignment system for use in the osteotomy of an ulna having a proximal end, a distal end, a long axis extending between the proximal and distal ends, and an trochlear notch having an articular axis;

• the ulnar cut guide alignment system comprising:
• (a) an ulnar alignment guide having a first end for attachment relative to the proximal end of the ulna, a second end for attachment relative to the distal end of the ulna, and a long axis for placement parallel to the long axis of the ulna;
• (b) an ulnar cut guide holder including a body having an aperture extending therethrough along a longitudinal axis;
• (c) ulnar cut guide locator for connecting the ulnar cut guide holder to the ulnar alignment guide with the longitudinal axis through the aperture of the body of the ulnar cut guide holder placed substantially coextensive with the articular axis of the trochlear notch of the ulna when the first end of the ulnar alignment guide is attached relative to the distal end of the ulna and when the second end of the ulnar alignment guide is attached to the proximal end of the ulna;
• (d) ulnar rotation guide for positioning in the trochlear notch of the ulna;
• and
• (e) an ulnar rotation guide shaft for attaching the ulnar rotation guide to the ulnar cut guide holder along the longitudinal axis of the aperture in the ulnar cut guide holder.