study by Geeslin and LaPrade indicated that patients reported positive outcomes in 94% of cases following a mix of repairs and reconstructions for with acute posterolateral knee injuries. Recent studies have reported failure rates between 37 and 40% for primary repairs of the main PLC structures Studies have shown that patients who undergo successful surgical repair of posterolateral knee injuries reported increased objective knee stability and better subjective outcomes than those who undergo reconstruction. A study by LaPrade et al. showed that patients with isolated or combined PLC injuries have positive outcomes when they undergo anatomic reconstruction of the damaged structures, and there was no difference between groups that require an osteotomy versus those who do not. Patients reported significant increases in both knee stability and function following reconstruction. Anatomic techniques aim to restore normal function of the knee's important static stabilizers and are recommended for patients with these types of injuries to provide the best outcomes. Epidemiology Isolated and combined posterolateral knee injuries are difficult to accurately diagnose in patients presenting with acute knee injuries. The incidence of isolated posterolateral corner injuries has been reported to be between 13% and 28%. Most PLC injuries accompany an ACL or PCL tear, and can contribute to ACL or PCL reconstruction graft failure if not recognized and treated. A study by LaPrade et al. in 2007 showed the incidence of posterolateral knee injuries in patients presenting with acute knee injuries and hemarthrosis (blood in the knee joint) was 9.1%. Research Future research into posterolateral injuries will focus on both the treatment and diagnosis of these types of injuries to improve PLC injury outcomes. Studies are needed to correlate injury patterns and mechanisms with clinical measures of knee instability and laxity. References External links Steadman Philippon Research Institute Knee injuries Ligaments of the lower limb