Polydactyly is another relatively common congenital hand deformity. A mild case of polydactyly is characterized by excess skin and flesh on one side of the normal finger, with a tip attached to the finger; a heavy case of polydactyly is characterized by a more fully developed redundant finger, often attached to the metacarpal or phalangeal bone of the main finger, or to the side of the metacarpophalangeal or interphalangeal joint; the morphology and structure of polydactyly vary, and a more fully developed polydactyly resembles a normal The morphology and structure of the polydactyly are different, and the more fully developed polydactyly resembles a normal finger with corresponding bones, tendons, nerves, blood vessels, and nails, and the activity is similar to that of the main finger, which makes it difficult to choose a finger for surgery. When is the most appropriate time to operate? All children with polydactyly require surgical treatment to remove the extra finger and improve the shape of the finger; an x-ray of the hand must be taken before surgery to examine the relationship between the proximal epiphysis of the extra finger and the main finger to guide the surgery. If the redundant finger is only a dermatome attached to the main finger by the tip, it can be removed at any time during the child’s life. In the case of a well-developed polydactyly, especially one that is attached to the thumb, caution should be exercised. The preoperative procedure carefully compares the shape of the polydactyly with the primary finger and the patient’s use of it, examines the distribution and innervation of nerves and tendons, compares the active and passive movements of the two fingers, and removes the less functional of the two fingers; usually, the less developed finger is often located on the lateral (radial) side of the thumb. In the case of a well-developed polydactyly, the surgery can be slightly delayed, for example, it can be performed before the patient is of school age. If the finger to be preserved requires orthopedic surgery of the bones and joints, it is best to wait until epiphyseal development has largely ceased before performing the surgery. What should I do after surgery? If the dressing is not loosened and there is no odor or purulent discharge from the hand, there is no need to change the dressing and the sutures can be removed at 14 days after surgery. If orthopedic surgery of the bones and/or joints of the fingers is performed at the same time, appropriate internal and external fixation of the hand is required.