Floating thumb is generally referred to as floating thumb, the clinical manifestation of the thumb lack of metacarpal bone or only remains, in short, there is no bone support inside, such a thumb has no function, can not do anything, but only with the swing of the hand and swing, if not corrected in a timely manner will have a very great impact on the function of the hand. Why do you say so? Because the function of the thumb in the hand function accounts for a large proportion, we usually take things, hold things, write, screw the bottle cap and a series of actions basically will use the thumb, if the thumb function is damaged, these actions will be very limited or even can not do, the child in the school learning, playing will be very difficult, and along with this may also have a psychological impact on the physical and mental development of the child is very unfavorable, so we more recommend that Timely correction. Generally, it is better to operate when the child is around 6 months to 1 year old, because this is the time when the child’s thumb function is being established, and this is the time when the operation can make the child’s thumb function smoother. At present, we mainly use the hemimetacarpal bone grafting technique to reconstruct the first metacarpal bone from the second metacarpal bone of the affected hand. The whole operation is performed on the hand only, and it will not affect other parts of the body, and the function and appearance of the hand can be significantly improved after the operation. The most noteworthy thing is that the half-metacarpal bone graft reconstruction technique can advance the operation time by 6 months to about 1 year old, which is a very favorable time for the child. After the surgery, the child can start functional exercises, writing, holding objects, screwing bottle caps and other daily life movements can be completed, the child will not have too much impact on the future of school.