The MCL (medial collateral ligament) is located on the inner part of the knee, and connects the femur to the top of the tibia. It is very common that an MCL tear accompanies an ACL injury. An ACL reconstruction is performed after the MCL is allowed to heal naturally. However, the MCL does not always heal, and sometimes requires surgery. Failure to treat the MCL, when indicated, increases the risk of the ACL to not properly heal. Arthroscopic reconstruction is the preferred approach for an ACL tear, although, when an MCL tear is present, MCL reconstruction is usually performed through a small open incision. Once the ACL and MCL injury has been treated, patients will begin a rehabilitation program, as directed by your physician. Typically, patients are able to resume normal activities within 6 months after surgery.