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Mississippi Sports Medicine and Orthopaedic Center, Jackson, Mississippi
The Hospital for Special Surgery, New York, New York
Seven fresh-frozen cadaveric elbows were used to evaluate the extent to which the medial collateral liga ment must be injured before arthroscopic evidence of valgus instability is seen, the amount of ulnohumeral joint opening that does occur after such an injury, and the elbow position that maximizes visualization of this opening. While visualizing the most medial aspect of the ulnohumeral joint arthroscopically through the an terolateral portal, we sequentially sectioned the medial collateral ligament complex until all of the medial liga mentous restraints were cut. A valgus load was applied after each incision, and the extent to which the ulno humeral joint opened was measured. Ulnohumeral joint opening was not visualized in any specimen until complete sectioning of the anterior bundle was per formed. After the anterior bundle was released, 1 or 2 mm of joint opening was present in all specimens. Complete release of the medial collateral ligament led to dramatic increases in medial joint opening in all seven specimens (4 to 10 mm). Varying the angle of elbow flexion from 15° to 120° revealed that visualiza tion of the medial joint opening was best at 60° to 75°. Finally, forearm pronation increased ulnohumeral joint opening and supination decreased joint opening in all specimens. We found that the entire anterior bundle must be sectioned before measurable and reproduc ible medial joint opening can occur.
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