The anterior and posterior cruciate ligaments are important stabilizing structures of the knee joint, hinged between the intercondylar fossa of the femur and the intercondylar ridge of the tibia, preventing the tibia from shifting forward and backward along the femur. The anterior cruciate ligament originates from the medial aspect of the lateral femoral condyle and ends obliquely and inferiorly at the anterior part of the tibial intercondylar ridge and the anterior angle of the medial and lateral meniscus; the posterior cruciate ligament originates from the lateral aspect of the medial femoral condyle and ends obliquely and inferiorly at the posterior part of the tibial intercondylar ridge and the posterior angle of the lateral meniscus. When the knee joint is active, a portion of each ligament is under tension. Therefore, in addition to the anterior cruciate ligament, which prevents forward displacement of the tibia, and the posterior cruciate ligament, which prevents backward displacement of the leg bone, they can also limit hyperextension, hyperflexion, and rotation of the knee joint. In clinical practice, we often encounter patients who are not aware of cruciate ligament injury and do not receive timely treatment, which often leads to meniscus injury and articular cartilage injury, seriously affecting the function of the knee joint. Therefore, we remind you that if you feel that you cannot stop in a fast walk, make a sharp turn, dare not make a single-leg jump, or have joint weakness, you should consult an arthroscopist promptly to determine whether there is a cruciate ligament injury!