A full knee dislocation occurs when the tibia separates from the femur. The ACL, PCL, MCL and LCL ligaments may be all torn. This can occur when there is a high velocity twisting injury to the knee. It is a serious injury which requires immediate evaluation for vascular injuries with surgical intervention to repair or replace the damaged ligaments. post operative care including physical therapy, swelling control, range of motion exercises are the key to a great outcome.