The most traditional treatment for floating bunions is schematic bunionization, after which the child has only four fingers. The method used later was hemi-metatarsal reconstruction, which involves taking bone from the foot to reconstruct the first metacarpal and the first carpometacarpal joint. The advantage of hemi-metatarsal reconstruction is that the five fingers can be preserved, but the problem is that there is a possibility of bone resorption, and because the foot needs to bear weight, the metatarsal bone is weaker after removal, and is prone to fracture or bending. In addition, the child cannot go down to the ground for three months after the surgery and has to lie in bed. We are now taking part of the bone from the second metacarpal of the child to reconstruct the first metacarpal. This procedure has minimal impact on the donor area and does not affect the growth and development of the second metacarpal. After the surgery, the thumb function can be restored by about 70%, and the child can grasp heavy things, hold thick things, write, hold chopsticks, grasp small red beans, small green beans, rice grains, etc.