Regular occurrence of sprains is mainly due to the following aspects: 1, there may be a history of joint sprains, that is, previous sprains, the patient did not get sufficient rest so that the joint is not repaired in a timely manner, resulting in joint instability, asymmetry of muscle and tendon strength around the joint, the patient is particularly prone to sprains when exercising or weight-bearing; 2, due to poor posture, such as in 2, due to poor posture, such as in the strenuous exercise before the lack of adequate warm-up exercise and exercise process posture is not correct, will be particularly easy to sprain; 3, due to musculo-neurological disorders resulting in poor muscle strength, or lower limb muscle uncoordinated sprain.