Floating Finger is a severe form of thumb dysplasia in which the thumbs are suspended in the palm of the hand, and they are connected to each other by a single dermatome with no metacarpal bone. The floating finger is very fragile. If the thread is accidentally wrapped around the skin tip of the floating finger, it is very likely that blood flow will be impaired, leading to necrosis of the floating finger. Can we save such a fragile thumb? The answer is yes! There are two ways to save the fifth finger with floating finger, metatarsal bone reconstruction and hemimetacarpal bone graft reconstruction. Both methods involve the removal of bone for metacarpal reconstruction, the difference being the location of the bone. Metatarsal reconstruction takes the metatarsal bones of the foot, although it can save the floating finger, but there are some effects, the child has the possibility of bone graft resorption, necrosis, and the child can not bear weight on the foot for three months after the operation, can only sit or lie down, and after the operation will leave a very obvious scar on the foot, and will cause permanent damage to the foot, and from then on, can’t strenuously run or jump. Metacarpal bone grafting is a procedure that takes a portion of the second metacarpal bone from the affected hand and rebuilds the first metacarpal bone. The entire procedure is performed on the hand only, and there is no damage to other parts of the body. After the surgery, the child can run or jump as much as he/she wants, and the care is much simpler than metatarsal bone graft reconstruction. More importantly, the risk of bone graft resorption and necrosis is greatly reduced, and the age of surgery is brought forward to around 6 months to 1 year, so the child will not be forced to form the habit of holding objects with the index and middle fingers, and the process of establishing thumb function will be smoother.