There are two ways to preserve the floating thumb, one way is to take the bone from the foot. Although taking the bone from the foot can preserve the thumb, there will be some problems, such as not being able to go down to the ground in the early postoperative period, which will affect the function and shape of the foot to a greater or lesser extent, and the risks are higher. Therefore, instead of taking the bone from the foot, we now take part of the bone from the second metacarpal of the child to reconstruct the first metacarpal, called hemi-metacarpal bone graft reconstruction (SMRT floating bunion reconstruction). With hemi-metacarpal bone graft reconstruction, it is relatively less traumatic, does not affect walking, and does not affect the function or shape of the foot. The floating bunion is more troublesome to preserve, and a lot of work has to be done, such as bone reconstruction, tendon function reconstruction, skin soft tissue reconstruction, and functional exercise. But even if the floating bunion is more complicated, we can go ahead and preserve it.