A thin, shortened forearm tilted to the ulnar side, dislocation of the radial head, and limited rotational function of the forearm are among the clinical symptoms of congenital ulnar agenesis disease. Because it is a congenital disease, there are no effective preventive measures. However, more than avoiding the disease, we should understand how to reduce the pain of the disease and alleviate the severity of the disease to some extent. 1.Change unreasonable habits: avoid carrying and carrying heavy objects. Avoid standing and walking for a long time, there should be a break in between to sit and rest. Try to sit on the toilet and squat less when you have a bowel movement. 2, reduce weight: reduce weight to reduce the pressure and wear of the joint, can effectively prevent other orthopedic complications. 3, avoid joint injuries: pay attention to the safety of sports venues and sports equipment to avoid injuries. Warm up before exercise, gradually increase the amount of exercise from small, do not start to participate in the heavy load of exercise. Relax in time after a lot of exercise. The elderly should avoid falling when walking. 4, change the unreasonable way of exercise: Taijiquan and other half squat or squatting movement on the lower limb joints is very stressful, should be avoided as far as possible. Climbing hills and buildings, etc. to increase the pressure on the joints of the lower limbs, should be avoided as far as possible. As we grow older, we should gradually adjust our exercise regimen to include swimming, cycling and walking, and reduce the amount of heavy exercise. 5, the correct treatment of joint injury: there are also some forearm fine is due to other structures within the joint after the injury. It is important to correctly deal with meniscus injuries in the early stage.