And that demarcation that you can see between the original bone and the new bone acts as a very slight point of weakness, so actually now the surgeon can come along, can harvest away that new bone, and the periosteum can grow back, so you're left with the leg in the same sort of state as if you hadn't operated on it in the first place.
另外你们所看到的， 在原骨骼和新骨骼之间的分界线， 算是比较薄弱的地方， 所以现在外科医生就可以来 把新骨骼取走， 而骨膜能长回来， 所以你的腿 也会恢复原貌， 就像什么都没发生过一样。