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The Spontaneous Healing of a Torn Anterior Cruciate Ligament

The anterior cruciate ligament (ACL) restrains anterior translation of the tibia on the femur and controls rotation of the knee. Successful operative and nonoperative treatments of torn ACLs exist. ACL-deficient knees may develop meniscal injuries. Secondary stretching of the joint capsule/ligamentous restraints knee may also increase knee instability and degenerative changes. ACL reconstruction is recommended to help patients maintain activities that place shear and torque forces on the knee or to ameliorate persistent pain due to instability. Most injuries to the medial collateral ligament (MCL) are successfully treated nonoperatively without increased risk of osteoarthritis despite some residual laxity. Different treatment of cruciate ligament injuries is based on the poor healing potential of the ACL compared with the MCL. A middle-aged active female suffered a complete rupture of her anterior cruciate ligament, which then spontaneously healed. The patient had a protracted treatment course, complicated by quadriceps inhibition and proprioceptive deficits. She responded to a progressive rehabilitation program and made a good functional recovery. A literature review of spontaneous ACL healing is presented.