Knee pain after squatting, but no pain in the daily walking process, indicating that it may be produced by the following two conditions: First, it means that the injury and lesion of the knee joint is not serious, when the knee joint lesion is mild, the knee joint is not heavy when standing and walking, so the pressure on the injury site is not heavy, and a minor injury will not lead to more obvious clinical symptoms. But if the injury is heavy, even standing and walking will produce obvious pain. Second, pain when squatting but no pain when walking may be due to an injury to the posterior aspect of the knee, especially the posterior horn of the meniscus, which is crushed when squatting, but is not compressed when standing up, so there is no pain.