Functional outcome following PCL and complex knee ligament reconstruction

The purpose of this study was to evaluate the functional outcome of surgical reconstruction of the posterior cruciate ligament (PCL). In particular we wanted to document the recovery of knee muscle function. Twenty three patients underwent single bundle reconstruction of the PCL. There were four isolated PCL reconstructions. The remainder had PCL reconstructions combined with other ligament reconstructions. Patients were followed up at 2, 6, 12 and 26 weeks post operatively and underwent detailed functional assessment at 12 and 24 months. Outcome measures included the International Knee Documentation Committee (IKDC) score, the Tegner activity rating, and muscle dynamometry evaluating peak torque for knee flexion and extension. At final follow up 19 (83%) patients were rated as normal or nearly normal by the IKDC score. Seventeen (74%) patients returned to moderate or strenuous activity. Ligament stability was rated as normal or nearly normal in 20 (87%) patients. All 23 patients regained normal or nearly normal range of motion of the knee following surgery. Knee flexion peak torque demonstrated an average percentage deficit from the normal side of 24% at 12 months and 14% at 24 months. The deficits for extension were 35% and 9% for the same time points. PCL reconstruction is associated with a satisfactory clinical outcome but muscle function abnormalities may persist for 2 years.