When a surgical reconstruction is necessary for a patient with an anterior cruciate ligament (ACL) injury, autologus tissue from either a bone-patellar tendon-bone or hamstring tendon grafts is preferable. There are relative and absolute contraindications for the use of either tissue, in addition to the surgeon's own preference. For example, a patient with Erlos-Danlos ligamentous laxity is not a candidate for a hamstring ACL reconstruction.