In the past, the only option for treating floating bunion was to remove the floating bunion and move the index finger to the thumb. After the surgery, the child’s thumb was functional, but the five fingers were no longer complete, which was still a disability in the eyes of some parents in China. This is still a disability in the eyes of some parents in China. Therefore, we now try to preserve the five fingers as much as possible, and I personally mainly use the hemi-metacarpal bone grafting reconstruction technique, where part of the second metacarpal bone of the child’s affected hand is taken to rebuild the first metacarpal bone, which can solve the problem of the floating thumb, and make the thumb’s appearance look a little bit better. However, this is not enough, we will use the second stage of surgery to build up the function of the thumb, so that the thumb can move and do things. After a period of time, the child’s hand will be able to squeeze small objects, such as soybeans and grains of rice, and hold large objects with a strong grip. In this way, the form and function of the thumb can be balanced. The hemimetacarpal bone graft reconstruction technique is usually done between the ages of 6 months and 1 year, allowing the child to establish thumb function earlier.