Some time ago, I saw a child in my clinic who had flown in from Guangdong to see a doctor. His right hand was the rare mirror image hand. Today, based on this case, I would like to give you an issue of popularization of this finger deformity, Mirror Shadow Hand. What is mirror image hand? Mirror shadow hand is a special kind of congenital hand and foot deformity, named after the symmetrical twin deformity on both sides of the fingers, whose shape is like the shadow of a mirror. Although he seems to be more than normal fingers, but in fact there is no thumb function, some need to use the thumb to complete things, this kind of baby to do it is very difficult. Second, what are the causes of mirror image hand? Mirror shadow hand is one of the congenital hand and foot deformities. The cause of its development is not yet clear, may be related to the following factors: 1, genetic The incidence of this chance is not controllable, the child may or may not have, it is impossible to say. 2, the mother’s early pregnancy poor health In the four weeks of pregnancy to eight weeks of this stage, is the baby finger development of the critical stage, this stage of the baby’s finger will develop from a very small germ into a complete finger, if disturbed at this stage, it is easy to lead to the baby’s fingers are not well developed, incomplete, or multi-fingered, and finger and other problems. If the mother’s health status is not good at this stage, for example: malnutrition, illness and other reasons will have an impact on the baby’s hands and feet development. 3.Mother’s early pregnancy, exposure to some chemical factors As mentioned in point 2, the fourth to eighth week of pregnancy is very important for the development of baby’s hands and feet, if at this stage, the mother has been exposed to some chemical factors, such as: medication, chemicals, radioactive factors, smoking or passive smoking, etc., will have a negative impact on the baby’s development. Third, what is the focus of mirror hand surgery? Mirror shadow hand treatment, not simply remove the excess fingers and metacarpal bones on the line, but also the use of finger bunionization method to reconstruct the baby’s thumb, after the operation, the child can not only use the hand to hold things, but also with the hand pinch things, basically to meet the needs of daily life. When is the right time for mirror hand surgery? Many parents of babies with mirror image hand ask me, “When is the best time to perform the surgery?”. In fact, we generally recommend that the surgery be performed when the child is 6 years old. In fact, we generally recommend that the surgery be performed when the child is about 6 months old, because this is the time when the child’s thumb function is being established, and after reconstructing his thumb at this stage, his thumb function will be established more smoothly, which is more powerful for the child’s physical and mental development. In conclusion, surgery is the only way to improve the function of the hand for babies with Mirror’s Hand, and it is best to perform the surgery when the baby is around 6 months of age, because at 6-8 months of age, the baby’s thumb starts to build up independent function, and an earlier surgery is beneficial for the thumb to build up function.