TREATMENT OF ACUTE TRAUMATIC ELBOW INSTABILITY WITHOUT MEDIAL COLLATERAL LIGAMENT REPAIR – FUNCTIONAL ROLE OF THE DYNAMIC STABILIZERS

Abstract

In the past, the treatment of acute elbow fracture-dislocations has emphasized repair to the medial collateral ligament (MCL), with favorable results. We report improved results using a strategy based on lateral-sided repair (lateral collateral ligament, radial head, coronoid) without MCL repair. In forty-seven patients, this strategy resulted in a high degree of success with no residual instability (valgus or otherwise). The dynamic stabilizers of the elbow activated through early postoperative motion, are important adjunct to stability. We have devised a reproducible radiographic method to demonstrate this.

To review the surgical treatment of elbow dislocations without surgical MCL repair, and to determine if early active motion aids in restoring stability and concentric joint reduction.

In the setting of acute fracture-dislocation of the elbow, concentric elbow stability with excellent functional results can be achieved using laterally-based surgical strategy without MCL repair. The dynamic stabilizers of the elbow, activated through the early motion, assist in providing joint congruity and stability.

Forty-seven patients with acute elbow fracture-dislocations requiring operative treatment were treated at two university-affiliated teaching hospitals and evaluated an average of twenty-one months after injury. The protocol consisted of repair of the ulna and coronoid, repair or replacement of the radial head, and repair of the LCL, and early motion. The MCL was not routinely repaired. The LCL origin had been avulsed and reattached in all patients. One patient had a second procedure related to malpositioned radial head prosthesis. A stable mobile (average one hundred and one degree arc) articulation was restored in all patients. There was no evidence of valgus instability in any patient. Early motion was initiated at a mean of two weeks postoperatively. Postoperative ulnohumeral joint space opening improved from 4.9 ± 1.2 mm in the early postoperative period to 2.0 ± 0.5 mm (p < 0.00003) at final follow-up. We believe this is due to the effect of the dynamic stabilizers, which were allowed to function through early motion.