Flexor tendon stenosing tenosynovitis in infants and young children, most common in the thumb, also known as thumb stenosing tenosynovitis or trigger finger, in addition to the ring finger, index finger and little finger also have occasional incidence, belongs to the congenital disease, there are parents and even some doctors colleagues will raise this question, “the child was born well, and then later appeared to have finger flexion and extension of the bad ah? How can it be a congenital disease?” This starts from the pathogenesis, many colleagues believe that pediatric stenosing tenosynovitis has the same pathogenesis as adult tenosynovitis, and that it is due to “edema in a certain area” that leads to tendon entrapment in the tendon sheath, which is actually not true, there is no definitive report on the etiology of pediatric tenosynovitis, but there are abnormalities of the development of the seed bones in the metacarpal joints of the thumb. However, abnormal development of the phalanges at the metacarpophalangeal joint of the thumb, where the two phalanges are too close to each other, leading to narrowing of the tendon sheath, is one of the main causes. In addition, it has been suggested that the continuous hyperflexion of the thumb during fetal life in the mother’s womb results in narrowing of the entrance to the fibrous sheath on the metacarpophalangeal side of the metacarpophalangeal joint, and the proximal flexor tendon is enlarged, making it difficult for the tendon to pass through the sheath, although there is no clinical evidence for this. Presentation: The child’s thumb interphalangeal joints are flexed, and if the interphalangeal joints are passively forced to straighten, there is popping and the child cries. Onset is usually at half to one year of age. Treatment: For congenital stenosing tenosynovitis of the flexor tendons in infants and young children, a small number of children (not the “majority” as some doctors call it) will recover spontaneously within 6 months, so when it is first detected, conservative treatment can be used to help the child to move his fingers; however, in my personal experience, there is very little hope of recovery with conservative treatment, so I believe that the best and most effective treatment is surgery. The most effective treatment is surgery! Cut the narrow tendon sheath and release the tendon. Precautions: 1, must be hospitalized, the cost is usually not high, need to be hospitalized for about 4-5 days; 2, must be general anesthesia! In fact, the so-called general anesthesia, only the use of drugs to make the child in a sleep state, and then a little bit of local anesthetic in the finger jammed place, the operation is safe, reliable, there is no report that the child’s development and intelligence have a bad influence, and foreign countries are now more and more respected general anesthesia, is considered to be the most effective and safest anesthetic method, after the operation, the child will be able to wake up; 3, the second day after the operation that is to begin to help children Exercise fingers, promote early recovery, 2 weeks after surgery, wound removal; 4, early surgery, time delayed for too long, the fear of causing the fingers in the bad position of the development of deformity may be; 5, surgery is necessary, early detection, early treatment, less pain, the effect is accurate.