1.Clinical data There were 35 cases in this group, 8 males and 27 females, age 33-73 years old, average 56 years old. The longest duration of the disease was 1 year and the shortest was 3 months. 17 cases had right thumb, 4 cases had middle finger, 3 cases had index finger, 9 cases had left thumb, 1 case had middle finger, 1 case had index finger. All patients in this group had finger extension and flexion dysfunction with palmar bone pressure pain and local palpable soybean-sized nodules. The diagnostic criteria of stenosing tenosynovitis of the finger flexor tendon were met. The patient was lying on the treatment bed or sitting on the side of the treatment bed with the palm up, and the operator searched for the painful nodule at the metacarpophalangeal joint and localized it. After routine sterilization and laying of sterile sheet, 1% lidocaine 2ml infiltration anesthesia is satisfied, the left thumb is fixed at the position, the right hand holds 7# small sharp knife tip stabbed vertically into the subcutaneous, at the painful node parallel to the tendon up and down longitudinally cut the narrow tendon sheath, at this time can hear the “chattering sound” of cutting thickened tendon sheath, ask the patient to extend and flex the finger, observe whether the affected finger has extension and flexion dysfunction, if there is still If there is still a slight popping sound, the operation can be repeated several times until the popping sound disappears, and then the knife is discharged, pressure is applied to stop the bleeding, and sterile gauze is wrapped. The patient was instructed to move the affected finger passively immediately after surgery to prevent adhesions. 3, treatment results 35 cases have obtained a good result of a cure, three weeks after the finger extension and flexion function back to normal, the ringing sound disappeared, the pain disappeared. 4.Discussion Stenosing tenosynovitis of the finger flexor tendon is the result of long-term chronic strain. The mechanism of occurrence is long-term chronic strain, resulting in edema, hyperplasia and degeneration of the finger flexor tendon and tendon sheath, edema and hyperplasia of the tendon sheath narrow the bony fiber canal, which in turn compresses the already edematous tendon, and the finger flexor tendon is also degenerated by the pressure, forming a pike or gourd shape. When flexing the finger, the enlarged part of the tendon passes through the narrow tendon sheath and produces a plucking action and sound, accompanied by pain, commonly known as plucking finger. After a small sharp knife is stabbed vertically under the skin of the affected area, the tip of the knife is stabbed vertically into the tendon sheath tube and the narrow tendon sheath is cut open longitudinally in the process of pulling back to release the extrusion of the finger flexor tendon, so that the expanded tendon at both ends disappears rapidly, the flexor tendon passes smoothly in the sheath tube, the finger popping disappears, the finger extension and flexion function returns to normal, and the pain gradually disappears. The advantage of this treatment is that the affected skin is only 0.5M skin lesion, no suture, little trauma, little pain, easy to be accepted by patients, and can achieve the purpose of curing the disease at one time. The caution is to enter the skin vertically to reduce the length of the incision, to cut the narrow tendon sheath subcutaneously to a sufficient length during the operation, to operate with strict aseptic technique, and to take oral antibiotics for 3 d after the operation to prevent infection of the incision.