Osteotomy to achieve the purpose of face-thinning may have sequelae, such as bone destruction or poor effect after operation, resulting in poor facial coordination, or slightly different bone sections on both sides, resulting in facial asymmetry.

1. Destruction of bone: the integrity of bone will be destroyed during the operation. Even after self-repair the day after tomorrow, the stability of bone cortex will be affected to some extent after osteotomy, so it is more likely to fracture than ordinary people under the impact of the same force.

2, the surgical effect is not good: if the local morphology is not properly controlled in the process of bone thinning, it may lead to postoperative correction.