There are many factors that affect the results of ACL and PCL reconstruction: 1. Early or late surgery: the earlier the surgery, the better the postoperative results, because if the surgery is very late, the joint degenerates and ages, and all parts of the knee joint are lax, the surgical technique will not be as good as if the joint is not aging and worn out. 2. Surgical technique: The surgical technique is directly related to the surgical result. The position of the bone tract is often 2-3mm different, which will affect. 3, the condition of the patient’s knee joint, the meniscus tears in the knee joint during surgery are serious and need to be removed, the cartilage is widely peeled, compared with the meniscus without damage and the cartilage without damage, the effect will be different. 4. Combined injuries of the patient’s knee: if combined with other ligament injuries (multiple ligament injuries) or combined with fractures of the tibial plateau and other parts of the knee will affect the results of the surgery, even if the surgery cannot be performed immediately, and for severe old tibial plateau collapse fractures, the ligament reconstruction surgery cannot even be performed again. 5. Inadequate postoperative rehabilitation also affects the surgical effect. If the postoperative rehabilitation is too aggressive, the ligaments may be lax. If the postoperative rehabilitation is too slow and painful, the knee joint may adhere.