The tendon sheath is a double-layered, casing-like, airtight synovial tube that covers the outside of the tendon and serves as a synovial sheath that protects the tendon. It surrounds the tendon in two layers, and a cavity between the two layers is the synovial cavity, which is lined with the synovial fluid of the tendon sheath. The inner layer is in close contact with the tendon, and the outer layer is lined inside the tendon fiber sheath, which is jointly combined with the bone surface and has the function of fixing, protecting and lubricating the tendon from friction or compression. The tendon sheath has the function of maintaining the normal flexion and extension of the fingers and the sliding of the tendons. When the hand is fixed in a certain position for repetitive, excessive activities, so that the tendon and tendon sheath often friction between the tendon, resulting in edema, fibrous degeneration, caused by the narrowing of the internal cavity. Due to the tendon in the tendon sheath activities, through the narrowing of the pathway, resulting in pain and movement disorders, this is tendovaginitis, also known as stenosing tendovaginitis. A, tenosynovitis classification 1, radial tuberosity stenosis tenosynovitis tenosynovitis tendinosis slow onset, gradual aggravation, the wrist thumb side of the bony prominence (radial tuberosity) and the thumb around the pain, the thumb activity is impeded, in the radial tuberosity pressure and friction sensation, and sometimes in the radial tuberosity there is a slight bulging pea-sized nodule. If the thumb is held tightly within the other four fingers and flexed to the medial (ulnar) side of the wrist, severe pain occurs at the radial tuberosity. In the acute phase, localized swelling may be present. When the enlarged tendon passes through the narrow tendon sheath as a “tunnel”, when the thumb is flexed, a loud sound will occur, which is also known as “ringing finger”. Flexor tendon tenosynovitis mostly occurs in the thumb and middle finger. Flexion and extension dysfunction of the affected finger is especially obvious when waking up in the morning, and can be alleviated or disappear after activities. The pain sometimes radiates to the wrist. Flexion of the metacarpophalangeal joint may cause tenderness, and sometimes thickened tendon sheaths and pea-sized nodules can be detected. When bending the affected finger, it suddenly stays in the semi-bent position, and the finger can neither be straightened nor flexed, as if it is suddenly “stuck”, with unbearable pain and soreness, and after triggering it with the assistance of the other hand, the finger is able to move again, generating trigger-like movements and popping, so it is also known as “trigger finger”. Therefore, it is also called “trigger finger”. Second, the treatment of tenosynovitis The treatment of tenosynovitis: the affected area can be used heat therapy, massage and adequate rest for about 3 weeks, especially to reduce the manual labor caused by the disease. Local closed treatment, can make the early tendovaginitis get relief, closed once a week. If the above treatment is ineffective or recurrent, tenosynovectomy should be performed, and after the operation, early finger flexion and extension activities should be done to prevent tendon adhesion. Free from manual labor for 1 month after surgery.