There are two types of reconstructive surgery, metatarsal reconstruction and hemi-metacarpal grafting. Although both types of surgery can save a child’s thumb, I prefer the latter. Metatarsal reconstruction, as the name suggests, involves taking a portion of the metatarsal bone from the foot and reconstructing the first metacarpal bone, so which part of the metatarsal bone is the metatarsal bone? The metatarsal bone is located in the front part of the foot, and its base, together with the cuneiform bone and the dice bone, form the metatarsophalangeal joint, which belongs to the weight-bearing area, and it is an important device when the human body stands upright, walks, and bears weight. If the metacarpal bone is taken from here to reconstruct the metacarpal bone, there will be some impact on the foot, and the child can’t go down to the ground for three months after the operation, and can only sit or lie down, which is more troublesome to take care of. The metatarsal bone reconstruction also has a certain chance of resorption and necrosis, which is also a concern for many parents. In the case of hemimetacarpal bone grafting, a portion of the second metacarpal bone is taken from the affected hand to rebuild the first metacarpal bone. The entire surgery is performed on the hand only, without affecting other parts of the body, and the postoperative care is relatively simple, and the chances of bone resorption and necrosis have been greatly minimized. Most importantly, the hemi-metacarpal bone graft reconstruction technique can advance the age of surgery to around 6 months to 1 year. This is a good time to undergo the surgery because it coincides with the stage when the child’s thumb function is being established.