Tenosynovitis, also known as “snapping finger” and “trigger finger”, is a common chronic soft tissue injury disorder of the hand that can occur at different ages, mostly in middle-aged women and manual laborers, and also in infants and children. In infants and children, the thumb is more common, while in adults, the middle ring finger is more common, followed by the thumb. Clinical manifestations Painful finger, bouncing action, such as pulling the trigger, and accompanied by a popping sound. In severe cases, tendon entrapment may occur, and the affected finger is passively fixed in the flexion or extension position, unable to move on its own, and requires the help of the healthy hand to move, with the symptoms worsening in the morning and after labor, and relieved by activity or hot compresses. Etiology The tendon sheath of the finger flexor tendon is composed of a layer of fibrous sheaths around the periphery of the finger flexor tendon, namely the tendon sheath, and a bony sheath composed of a bony shallow groove on the palmar side of the metacarpophalangeal joint and the transverse fibrous tissue of the flexor tendon sheath, namely the tendon sheath slide. The tendon sheath is a sheath of bony fibrous tissue on the palmar side of the metacarpophalangeal joint. When the patient is engaged in long-term hand labor or local pressure, the finger flexor tendon and tendon sheath repeatedly rubbed, squeezed local congestion, edema, followed by local degeneration, adhesions, so that the tendon sheath local narrowing, forming a buttonhole shape. The finger flexor tendon is squeezed and thinned, and the two ends are expanded into a gourd shape. When the finger flexes and extends, the enlarged part of the tendon passes through the narrow tendon sheath carriage, and then the bouncing action of the finger occurs, and causes pain, resulting in limited flexion and extension of the affected finger. When the tendon sheath is degenerated and the adhesions are heavy, the tendon will become embedded and the affected finger will be passively fixed in the flexion or extension position, making it difficult to move. Commonly used treatment methods Most of the local topical or with internal blood anti-inflammatory drugs; or the local lesion to take closed injection anti-inflammatory; or take local physiotherapy, hot compress, acupuncture, massage and other treatment, although there is a certain degree of effectiveness, but individual differences, and the efficacy is uncertain, easy to relapse. In the past, for patients with finger flexor tendon entrapment or typical “trigger finger” sign when finger activity, most of the finger flexor tendon tendon sheath slip local lesion excision, tendon release surgery treatment. However, there are problems such as greater surgical damage, longer recovery time, and scar adhesions of the surgical incision.