Ms. Liu, 40, woke up early in the morning with limited movement of her right index finger, and when she flexed or passively flexed it, it produced a trigger-like action, and her finger was painful and made a popping sound. When she went to the orthopedic department of the hospital, the doctor said that she was suffering from stenosing tenosynovitis of the flexor tendon. Because the disease moves like a gun trigger, it is also known as trigger finger. This disease is also known as trigger finger. What is trigger finger? The movement of the hand is powered by muscles, and the muscles are connected to the bone by tendons. On the outside of the tendon is a fibrous sheath called the tendon sheath. The tendon sheath is somewhat like a pulley that holds the tendon in place, in which the tendon slides back and forth with very little friction. As the tendon moves quickly and forcefully for a long time, the tendon and the tendon sheath rub together excessively, which can cause damage to both, resulting in chronic inflammatory changes such as edema and hyperplasia. The thickening of the tendon sheath makes the original loose and tight sheath become relatively tight, forming a narrow, and the enlarged and thickened tendon is compressed into a gourd shape, which hinders the back and forth sliding of the tendon, producing trigger-like action and popping. What are the manifestations of trigger finger The initial manifestation of trigger finger is stiffness and pain in the affected finger after waking up in the morning, and there is obvious pressure pain on the palm side of the finger root. The pain is relieved after a few moments of activity, and then a popping sound gradually appears, which can disappear after 1 to 2 hours of activity. With further development, the affected finger will be snapping and painful throughout the day, and even unable to extend and flex. A pea-sized nodule can be felt on the distal palm of the hand at the transverse palm stripe, and the pressure pain is obvious. When the finger is flexed, the nodule can be felt to move up and down, and a popping sound can be felt from it. How to prevent and treat trigger finger In the early stage of trigger finger, the symptoms can be relieved by restricting the movement of the affected finger or by intra-sheath injection of steroids. However, if no attention is paid to prevention, the disease is very easy to recur. The main preventive measures are to avoid prolonged rapid finger movements (e.g., prolonged knitting of sweaters). Do some preparatory activities before work, such as soaking the fingers in warm water, moving the fingers, and paying attention to finger rest after work. If the treatment is not effective, surgical treatment is also available: the narrow tendon sheath is opened to create a relaxed and comfortable environment for the tendon, and the symptoms are relieved.