Finger tendon extensions generally refer to surgical repair of avulsed or detached tendon tissue in the hand. The survival of the repaired tissue in the hand can be confirmed about 1 week after surgery, and if it survives, it is considered to have passed the risk period. Surgical intervention is required to repair a severed or avulsed tendon or muscle in the hand. Normally, the finger is revived within 1 week after surgery, and the blood flow and nerves of the muscle or tendon and other tissues are gradually restored. The function and blood flow of each part is reviewed 1 week after surgery, and if it is in good condition, it is usually considered to have passed the dangerous period. After the repair, the functional position of the finger should also be fixed for 3-4 weeks, and formal rehabilitation should be carried out only after the tendon anastomosis end has healed to avoid adhesions and contractures of joints and tissues. It is recommended that the patient should start to rehabilitate the finger gradually about 4 weeks after surgery, but it should be noted that all rehabilitative training must be carried out under the guidance of a professional rehabilitator and should be moderate, not too hasty.