The inability to squat may be related to knee meniscus injury, knee synovitis, severe patellofemoral osteoarthritis and so on. 1. Knee meniscus injury: When the knee joint is slightly flexed, if the knee joint is suddenly over-extended by internal or external rotation, it can cause meniscus tear. Symptoms such as joint pain, limited movement and inability to squat may occur. 2. Knee synovitis: Long-term strenuous exercise can cause the synovium to be repeatedly squeezed, resulting in localized swelling and pain. When more joint fluid is produced, it can also cause squatting difficulties. 3. Severe patellofemoral osteoarthritis: In long-term climbing, gym squatting and other activities, repeated flexion and extension of the knee joint can cause joint wear and tear, which can easily cause osteoarthritis, peeling of the cartilage surface, causing bone congestion, edema, and the inability to squat. When squatting is not possible, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.