Anatomic relation between the medial collateral ligament of the elbow and the humero-ulnar joint axis

The anatomic relation between the proximal attachment of the medial collate ral ligament of the elbow joint and the humero-ulnar joint axis has not bee n clearly shown in a published study. We examined cadaveric specimens to fi nd the exact relation between them. The medial collateral ligament was microscopically dissected to isolate spe cific fiber bundles. The length of each bundle was measured with a charge-c oupled device camera system that faced the medial side of the elbow joint. The measurements indicated that the projected length of the deep middle bun dle of the anterior oblique ligament, which is the strong cord-like part of the medial collateral ligament, is isometric during elbow flexion. The pro ximal end of the deep middle bundle was thus considered to be located almos t on the humero-ulnar joint axis.