A man-made ACL replacement made of a combination of man-made and naturally-occurring materials could provide a better option for repairing a patient's ruptured ACL. Most ACL treatments involve restructuring the ACL using patellar tendon grafts, but that procedure also leaves behind lingering knee pain. As an alternative, I suggest creating an artificial ACL made up of braided polyester fibers, an antioxidant and porous biomaterial, and calcium nanocrystals, which are found in human...