From Science Daily:
A synthetic graft for ACL reconstruction has been developed that integrates with the native bone, promotes growth of new ligament tissue, and stabilizes the knee. Connecting the femur to the tibia, the anterior cruciate ligament (ACL) rupture is one of the most devastating injuries in sports. No other injury has sidelined more athletes for a season or even the rest of a career. And ACL sprains and tears affect more people than just the pros.
See Link Here: http://www.sciencedaily.com/releases/2014/12/141230132858.htm