Stenosing tenosynovitis of the radial tuberosity manifests mainly as limited pain at the radial tuberosity. The disease starts slowly and worsens gradually, with pain at the bony prominence (radial tuberosity) on the thumb side of the wrist and around the thumb, impaired thumb movement, pressure and friction at the radial tuberosity, and sometimes a slight elevated pea-sized nodule at the radial tuberosity. 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”, the thumb will rattle when flexing, which is also known as “ringing finger”. Tenosynovitis is a chronic, sterile inflammatory change of the tendon sheath caused by mechanical friction. Stenosing tenosynovitis of the radial tuberosity is a common orthopedic disease, mostly seen in manual laborers, especially those who use their fingers to repeatedly do stretching, flexing, pinching, and gripping operations are susceptible to this disease, generally more women than men. Stenosing tenosynovitis of the radial tuberosity is common in domestic labor and manual workers, and it is more common in middle-aged and old women, with the ratio of women to men being about 6:1. The disease starts slowly, and the main manifestations are limited pain and elevation of the radial tuberosity, limited extension of the thumb, and pain when the thumb is doing large-scale extension and flexion, and it can be radiated to the hands, elbows, and shoulders, etc. The disease is also characterized by a unique triggering test. The diagnosis is clearer with the aid of specific provocative tests. Clinical attention should be paid to its combined diseases, and corresponding imaging examination should be carried out to exclude local ligament, bone and other tissue injuries and various degenerative changes. The diagnosis of stenosing tenosynovitis of the radial tuberosity must be differentiated from cross syndrome, arthritis of the first carpometacarpal joint and polyarthritis of the navicular size. Cross syndrome is relatively rare, with the painful swelling located about 4 cm proximal to the wrist at the cross of the muscle belly. In contrast, osteoarthritis of the adjacent joints is often characterized by imaging changes, such as bony encumbrance formation, degenerative sclerosis of the articular cartilage, and changes in the joint space. If the patient fails to be treated with non-surgical therapies, a stenosing tenotomy can be performed under local anesthesia. Intraoperatively, attention is paid to whether the tendon of the short and long extensor tendons are wrapped in the same tendon sheath. If they are in two separate tendon sheaths, both tendon sheaths must be incised. If there is a vagus tendon, it must be excised. The tendon is lifted up and the base of the tendon sheath is examined for abnormalities, and bone spurs, if any, are removed. Early postoperative thumb mobilization is practiced. Care should be taken not to injure the superficial branch of the radial nerve and the cephalic vein, which travel locally.