Cruciate ligament injury is a common sports injury of the knee joint, which can recover on its own from a minor injury, but a complete rupture usually does not recover on its own and needs to be treated accordingly. After a knee cruciate ligament rupture, patients may experience joint weakness and joint misalignment when walking, unable to walk fast, run or jump, and may be significantly limited in going up and down stairs. In this case, ligament reconstruction surgery should be performed under arthroscopy, which can restore the function of ligaments and normalize the function of joints. If the cruciate ligament injury is mild and does not affect the movement and stability of the joint, it can also be treated conservatively, usually with brace or cast fixation for 4-6 weeks and then gradually functional exercise to restore the patient’s motor function. It is recommended that patients standardize technical movements, increase lower limb muscle strength exercises and coordination exercises, wear the necessary protective gear, and keep the ground free of safety hazards to prevent cruciate ligament injuries in the knee.