Double knee joint squatting can not stand up, may be meniscus injury, synovitis, osteoarthritis and other causes. 1. Meniscus injury: If there is meniscus injury in human body, it is difficult to stand up in squatting due to severe pain. 2. Synovitis: If there is fluid in the joints due to synovitis, it may cause swelling and pain, and it may be difficult to stand up after squatting. 3. Osteoarthritis: the main symptom is pain, with the development of the disease, the pain gradually increases, may appear after squatting can not stand up. It is recommended that people who can’t stand up after squatting on both knees go to regular hospitals in time, clarify the cause of the disease, and standardize the treatment under the guidance of the doctor.