1. Persistent abnormal abduction of the leg in extension without abnormal antero-posterior or lateral mobility in flexion is probably due to laceration of the internal lateral ligament.
2. Persistent instability due to laceration of the internal lateral ligament will require correction by surgical procedure.
3. A fascial transplant embedded in the femur and tibia near the origin and insertion of the internal lateral ligament has proven a satisfactory method of repair in two cases.