螺旋CT三维重建诊断下颌骨踝状突矢状骨折

Three Dimensional Reconstruction of Spiral CT in Diagnosis of Mandibular Condyle Sagittal Fracture

探索三维ＣＴ对下颌骨髁状突矢状骨折（ＳＦＭＣ）的临床应用价值，分析ＳＦＭＣ好发位置及临床特点。材料和方法：对２５例（ ５０侧）疑有髁状突骨折的患者作了螺旋ＣＴ三维重建的检查，结合横断位和冠状位二维ＣＴ图像，确定ＳＦＭＣ。结果：１１例（１１侧）ＳＦＭＣ占检出的３８侧髁状突骨折的２８．９％（１１／３８），其中发生在髁状突中、外１／３交界段者９侧，髁状突内侧１／３段者２侧。４例ＳＦＭＣ并发下颌其他部位的骨折。结论：三维ＣＴ对诊断ＳＦＭＣ有着重要意义。ＳＦＭＣ好发于髁状突的中、外１／３交界段，其原因可能与髁状突的解剖特征及其与邻近结构的空间关系有关。

To study the diagnostic value of three dimensional (3D) CT in the sagittal fracture of mandibular condyle(SFMC),and analyse its predilection location and clinical characteristics. Materials and Methods: Spiral CT with 3D reconstruction were performed for 25 cases (50 sides) with clinically suspected fractures of mandibular condyle. Transverse and coronal CT sections of mandibular condyle were also investigated. Results: Mandibular condyle fractures were found in 38 sides of mandibular condyles, and among them 11 sides (28.9%) were SFMC. The location of predilection of SFMC was the conjunction segment of lateral 1/3 and middle 1/3 of mandibular condyle (found in 9 sides). Other 2 SFMC were found in medial 1/3 of mandibular condyle. Fractures combined with SFMC in other parts of mandibular condyle were found in 4 cases. Conclusion: Three dimensional CT is a valuable method in the diagnosis of SFMC. SFMC frequently occurs in the conjunction segment of lateral 1/3 and middle 1/3 of mandibular condyle, which may be related to the anatomical characteristics of mandibular condyle and its spatial relationship.