Anterior cruciate ligament (ACL) injuries: are one of the common knee ligament injuries, with a statistical incidence of 1/3000 per year. most ACL injuries occur during sports, especially rapid changes in direction and jumping, such as basketball, soccer, rugby, skating and field hockey. The mechanism of injury includes contact and non-contact types, with the non-contact type accounting for approximately 78% of injuries. Surgical and anatomical overview: ACL reconstruction with patellar tendon grafts can be combined with incisional and arthroscopic procedures. The middle 1/3 of the patellar tendon is excised, bringing the patellar bone mass superiorly and the tibial bone mass inferiorly. The ACL stump is removed arthroscopically, and bone channels are drilled in the tibia and femur. The graft is passed through the tibial bone channel and joint cavity to the femoral bone channel, and the femoral and tibial bone channels are each secured with a compression screw. The skin incision was sutured and the knee was fixed in a straightened 0° position with a hinge brace postoperatively.