Why is mirror hand surgery not a good idea? It is because too many people think this way, so the postoperative results are not always satisfactory. The difficulty of mirror hand surgery is not the removal of the extra finger or the thumbing of the finger, but the aesthetics while maintaining function. Why is it difficult? This child has a mirror-image hand with no thumb. The original thumb is a finger that is the same as the index finger, and from the perspective of the middle finger, both sides are the same, like looking in a mirror, with symmetrical growth. Children with mirror-image hand cannot do the opposite palm movement because they do not have a tiger and thumb, and only have the function of pinching objects, not pinching them. It is best to do this surgery in one go, so that all the skin, soft tissue, and bone tissue that can be used can be fully utilized, and both appearance and function can be taken into account. Which joint should be preserved during the surgery? Which joint should be removed? How to cut the bone? How to put it together? All of these should be considered before surgery, and a complete surgical plan should be made. It is important to be rigorous and cautious! The skin, soft tissues, and bone tissues that can be used in the surgery are limited. If you don’t get it right the first time, it’s a lot of trouble to get a second surgery to correct it, and the child suffers.