关键词: [关键词]　髁突囊内骨折, 分类, 下颌升支高度, 关节盘

Abstract: Objective　No universally accepted classification exists for intracapsular condyle fractures (ICF). In this study we proposed a new classification based on the concept of “disc-condyle” unit and aimed to validate the feasibility and clinical values of this classification. Methods　From 2010 to 2014, adult patients with unilateral intracapsular fractures were included and classified into three types. Type A was defined by reduction of the mandibular height with or without disc displacement. Type B had disc displacement without mandibular height reduction. Type C had no mandibular height reduction nor disc displacement. Open reduction and fixation treatment was performed for both type A and B fractures, while type C fractures were managed nonsurgically. CT, MRI, and function examination were conducted to evaluate patients’ prognosis and the clinical values of the new classification. Results　There were 55 patients included in this study, 31 with type A,17 with type B,7 with type C. In the 6-month follow-up, no differences in vertical ramus height, mandibular deviation, protrusion and lateral protrusion were observed between the fractured and healthy sides. All patients had normal occlusion and functional recovery post-operatively and only one patient in type A was reported to have pain in the joint area. MRI and CT examination showed good osseous healing and disc-condylar relationship in all cases. Conclusions　This study shows the effectiveness of the new classification, and the importance and the necessity to recover the position of the articular disc in the treatment and prognosis of ICFs.

Key words: Key words：　Intracapsular fracture, classification, vertical ramus height, articular disc