Patients who squat and get up with one hand on the knee, one hand on the table, or even with the help of others to stand up, are usually patients with osteoarthritis of the knee, which is very painful. According to statistics, the incidence of osteoarthritis of the knee is increasing year by year. 60% of people over the age of 50 have the disease, and about 80% of people over the age of 70 have the disease. Previously, osteoarthritis of the knee was thought to be a disease specific to the elderly, but clinical evidence suggests that secondary osteoarthritis often occurs in younger people as well. The disease is primarily painful in the early stages and painful and dysfunctional in the later stages. However, if this disease is taken seriously, early exercise and prevention can slow or even stop its progression and reduce pain. Knee joint self-test Knee arthritis starts with no symptoms, but you should go to the hospital for an examination if the following conditions occur: 1, squatting, turning, jumping, going up and down stairs, standing up after sitting for a long time, pain or pain worsens, but not at other times or is not obvious. 2. Knee stiffness in the morning, reduced after a little activity. 3.Knee joint flexion and extension will hear the “click, click, click” sound and ball friction. 4. Knee pain is worse after cold. 5.Joint deformation, can’t get up from squatting, can’t get up from squatting.