When a parent consulted with me, she said that her child’s right thumb metacarpal bone is missing, which is congenital, and was diagnosed as floating finger in the local hospital. The doctor said that the child is still too young now and suggested to do schematic thumb surgery before going to school, and the family could not accept this surgery plan, and did not know how to explain to the child later that her hand is different from others and has one less finger than others, and asked me if I could preserve the fifth finger. The congenital absence of the metacarpal bone of the right thumb floating finger can be preserved through hemi-metatarsal reconstruction and hemi-metacarpal bone graft reconstruction (SMRT floating thumb reconstruction), so parents do not have to worry too much, except that hemi-metatarsal reconstruction is a traditional surgical method that requires taking the metatarsal bone from the foot, while hemi-metacarpal bone graft reconstruction takes part of the bone from the child’s second metacarpal bone to reconstruct the first metacarpal bone, the surgery is only performed on the child’s hand and will not The surgery is performed only on the hand and does not affect other parts of the child’s body, and is the most advanced surgical method available. It is also the most advanced surgical procedure available. It is possible to preserve the integrity of the finger and improve the function and appearance of the thumb after surgery. Parents should do two things, the first is to let their child undergo the surgery as early as possible, preferably between the age of 6 months and 1 year, or at the latest before the child goes to school. The second thing is that after the surgery, you must follow our instructions and help your child to recover actively.