The problem of compound injury of anterior cruciate ligament (ACL) injury in the knee: Injury of the ACL in the knee with concomitant injury of the medial and lateral collateral ligaments can have a greater impact on the rotation of the tibial joint. The study of the limiting effect of ACL on the rotational motion of the knee, the different effects of ACL injury alone and compound injury on the anterior-posterior displacement of the tibia, and in cases where the medial and lateral collateral ligaments are repaired simultaneously, postoperative rehabilitation should consider these complex mechanical In cases where both medial and lateral collateral ligaments are repaired, postoperative rehabilitation should take into account these complex mechanics. We are more common in clinical practice for ACL injuries with meniscus damage and recommend a rehabilitation program based on the surgery, usually taking into account the local treatment of the meniscus during early weight bearing, whether it is resection or suturing, and different ways of load training.