Fragment displacement often happens in mandible fracture.This paper reports a typical case,in which the fracture fragment was pulled into the sublingual space by one genioglossus.

• 下颌骨粉碎性骨折多伴骨折段移位,其中在颏舌肌颏部附着周围骨折后,颏部骨折段被颏舌肌拉入舌下的病例,临床比较少见。