The treatment of posterior cruciate ligament injury currently has several treatment methods: 1, autologous semitendinosus femoris single bundle reconstruction 2, allogeneic Achilles tendon single bundle reconstruction 3, artificial ligament reconstruction, etc. The cost of surgery varies from 30,000 to 60,000, mainly because of the surgical approach and the use of surgical equipment to decide, at present, domestic cruciate ligament injury, especially posterior cruciate ligament injury arthroscopic reconstruction, only some tertiary hospitals can do.