Novel Methods for Diagnosis and Treatment of Posterolateral Rotatory Instability of the Knee

Injury to the posterolateral corner structures of the knee cause posterolateral rotatory instability, a condition has attracted increased attention over recent years1. injury is often associated with cruciate ligament injury, its diagnosis can be difficult unless one has a high degree clinical suspicion for an injury to the posterolateral corner 2,3. Although a number of treatment methods have proposed over the past twenty years2,4-12, there has been controversy regarding the optimal method of treatment for this injury. The consequences of missed unsuccessfully treated posterolateral rotatory instability can profound: reconstructed anterior or posterior cruciate can fail, and persistent posterolateral rotatory instability eventually cause pain, instability, and even degenerative 13-17. this report, we describe the use of an external rotationvalgus radiograph for the evaluation and diagnosis of rotatory instability, and we describe a new anatomical procedure involving use of a split tendon allograft for its treatment.