Pediatric congenital tenosynovitis is characterized by the inability to straighten the thumb (and occasionally other fingers) during infancy, or the thumb can be passively straightened, but with greater resistance or pain, sometimes accompanied by popping when the thumb is passively straightened. Pediatric congenital tenosynovitis is different from adult stenosing tenosynovitis, mainly due to the children’s nervous system is not fully developed, the coordination of flexion and extension of the fingers is low; or due to habitual flexion and biting of the fingers, or grasping toys, etc., children’s fingers are often involuntarily in the state of flexion, the thumb for a long time bending caused by the flexor tendon tendon sheaths of the finger slip car at the occurrence of inflammation and edema, in the thumb near the joints of the subcutaneous appeared A small hard knot appears under the skin near the thumb joint. If left untreated, some children will not be able to straighten their fingers due to prolonged flexion contracture of the thumb flexor tendon, resulting in finger dysfunction. Pediatric congenital tenosynovitis can be treated conservatively without excessive stress if parents detect it in time. Parents can often help their children to passively straighten their thumbs and correct their bent state. The correct way to do this is to gently hold the end of the thumb, slowly straighten the thumb, hold it in the extended position for a few minutes, and then release the thumb. This process can be repeated 5-10 times and can be done 2-3 times a day. During this process, do not forcefully knead the hard knot on the palmar side of the thumb. Most patients will return to normal with the conservative treatment described above, but a few more patients whose symptoms do not improve with the conservative treatment described above will need to be managed with surgical treatment. Surgery is relatively simple, release the tendon sheath to relieve the compression, and then with the postoperative thumb flexion and extension activities functional exercise, to prevent the scabbard adhesion again.