颞下颌关节脱位是一种常见病,面临床上多为颞颌关节前脱位,偶见外脱位,外后脱位或上脱位。当下颌骨遭受由前向后的打击力时,髁突颈不发生骨折,并向后移位进入外耳道或向上穿过关节凹进入颅中凹的情况是罕见的。复习文献,作者所查资料,国内尚未见髁突向后移位进入外耳道的报道,我科于1985年收治一例,现介绍如下: Temporomandibular joint dislocation is a common disease, the face of the bed mostly temporomandibular joint anterior dislocation, occasionally outside dislocation, external dislocation or dislocation. When the mandible is subjected to an anterior-to-posterior striking force, it is not uncommon for the condylar neck not to fracture, and to be displaced posteriorly into the external auditory canal or upwardly through the joint indentation into the concave portion of the skull. Review of the literature, the author investigated the information, the domestic has not yet seen backward posterior condylar migration into the external auditory canal, our department was admitted to a 1985 case, are as follows: