The posterior cruciate ligament is the main structure which provides provides posterior stability to the knee at 90° of flexion. At this position, it performs approximately 90-95% of the total force to preventing posterior translation. For this reason, most assessment for posterior knee translation instability is performed at 90° of knee flexion.
About the Author: Robert LaPrade, MD
Robert LaPrade, MD, PhD has specialized skills and expertise in diagnosing and treating complicated knee injuries. He has treated athletes at all levels, including Olympic, professional and intercollegiate athletes, and has returned numerous athletes back to full participation after surgeries. Recognized globally for his outstanding and efficient surgical skills and dedication to sports medicine, he has received many research awards, including the OREF Clinic Research Award considered by many a Nobel Prize in orthopedics. Dr. LaPrade is one of the most published investigators in his field, and many of the surgeries that he has developed are now performed worldwide and recognized as the “gold standard” for the treatment of complex knee injuries.