The PCL crosses behind the ACL inside the knee joint and prevents the tibia from sliding too far back. If the PCL alone is torn, surgical reconstruction is not always needed. However, if the PCL is torn along with the ACL (or other ligaments), reconstruction is usually required. This surgery is accomplished through the arthroscope and uses a graft to recreate both the ACL and the PCL. Once the ACL and PCL injury has been treated, and after a thorough rehabilitation program, as directed by your physician, patients are typically able to resume normal activities within 9 months following surgery.