The knee squatting can not consider and knee arthritis, synovitis, meniscus injury, chondromalacia patella, patella fracture and other reasons. 1. Knee arthritis: the cause is not clear, may be related to obesity, trauma and so on. Typical symptoms of knee osteoarthritis include joint pain, limited joint movement, joint deformity, joint swelling, etc., which can be manifested as knee squatting. 2. synovitis: the disease can be caused by infection, trauma, etc., can be due to limited joint activity and the phenomenon of knee squatting. Some patients are also prone to localized swelling, pain, skin temperature rise and other symptoms. 3. Meniscus injury: the disease is related to indirect violence trauma, long-term weight-bearing injury. Typical symptoms include pain, localized swelling, joint popping, limited movement, etc., which can be manifested as knee squatting. 4. Chondromalacia patella: the cause of the disease is not clear, may be related to long-term wear and tear of the joint, malnutrition and so on. There will be knee pain, limited joint activities and other symptoms, can also be manifested in the knee squatting. 5. Patellar fracture: the disease can also cause some patients can not squat. Patella fracture is a traumatic disease, mainly related to direct violence, indirect violence, typical symptoms include local pain, swelling and activity disorders. It is recommended that people who can’t squat on their knees should consult a doctor for timely examination, and follow the doctor’s instructions for standardized treatment after clarifying the disease.