Lateral femoral epicondylar osteotomy: an extensile posterolateral knee approach.

UNLABELLED: Open exposure of the posterolateral corner of the knee is challenged by limitations of posterolateral ligamentous tissues and posterior neurovascular structures. We have used a modification of a lateral femoral epicondyle osteotomy, described historically for surgical management of posterolateral rotatory instability, as an approach to the posterolateral intraarticular structures. The historic technique for ligamentous reconstruction has been abandoned because its nonanatomic fixation does not restore ligamentous isometry. In this report, osteotomy of a bone block from the lateral femoral epicondyle is used to access the joint space. The lateral collateral ligament is reflected distally and posteriorly through traction on the block. Once the intraarticular disorder has been addressed, the lateral femoral epicondyle is secured in its native, anatomic position, thereby restoring isometry and normal joint mechanics after surgery. This technique has been used successfully to address posterolateral articular disorders on femoral and tibial sides. Postoperative magnetic resonance imaging verified restoration of lateral collateral ligament anatomy. Physical examination at 0 degrees and 30 degrees knee flexion showed clinical stability at all postoperative evaluations through 6 and 10 months followup. Using this technique, intraarticular disorders at the posterolateral corner may be addressed in an open manner with anatomic reduction and preserved postoperative function of the lateral collateral ligament.

LEVEL OF EVIDENCE: Level V, expert opinion.