Sphincteritis is mainly seen in joints that are subject to frequent friction, including the wrist and knuckles, but also in the long bones and testicles. 1.Wrist joint and long bones: (1) Ulna and radius: it is mostly seen in the stem of the ulna and radius. A bony protuberance can be touched from the surface of the body, and long-term chronic strain can induce tenosynovitis of the wrist joint here. (2) Most bones such as tibia and fibula may develop sphincteritis if they are infected after trauma and sports injury. 2. Finger joints: The common finger joints that develop syringomyelia are the metacarpophalangeal joints of the thumb, which are located at the root of the thumb. 3. Testicles: testicular inflammation, epididymitis and other inflammatory diseases can occur in the testicles, and testicular syringomyelia can also occur. When tenosynovitis occurs, the above mentioned areas will have manifestations including pain, and it is recommended to go to the hospital in time.