title: Supra-acetabular external fixation for pelvic fractures: a digital anatomical study.
abstract: Supra-acetabular external fixation is an important tool for pelvic fractures. Understanding the anatomical characteristics of anterior inferior iliac spine (AIIS) is crucial for the operation. Here, we analyzed the morphology of AIIS and adjacent structures via a digital measurement mode. One hundred and twenty normal pelvic computed tomography (CT) scans were converted into three-dimensional digital models and their parameters were measured by Geomagics software. We obtained the values of 13 important AIIS anatomical characteristics, which were the perpendicular distance of the anterior superior iliac spine(ASIS) and AIIS (PDASIS-AIIS), the perpendicular distance between the AIIS and superior pubic tubercle (PDAIIS-PT), the distance between the AIIS and anterior median line (HDAIIS-ML), the angle of the pin tract line and the horizontal plane (AHOR), the transverse diameter of AIIS (TD), and the minimum diameter of the pin tract plane (DMIN), etc. Among them, six parameters showed significant difference between male and female (PDASIS-AIIS: P =0.040, PDAIIS-PT: P = 0.001, HDAIIS-ML: P = 0.019, AHOR: P = 0.021, TD: P < 0.001, and DMIN: P = 0.003, respectively). These results provided references in locating pinning site for a safer and more accurate supra-acetabular external fixation and also suggested that gender difference should be considered during the surgery.
authors: Department of Orthopedic Surgery, Shanghai First People's Hospital, Medical College, Shanghai Jiao Tong University, Shanghai, China.
authors: Fang
authors: F
authors: Wang
authors: Haihan
authors: H
authors: Song
authors: Fei
authors: F
authors: Zhao
authors: Qing
authors: Q
authors: Yang
authors: Hao
authors: H
authors: Tang
authors: Xiaoxi
authors: X
authors: Ji
authors: Qian
authors: Q
authors: Wang
authors: Zheng
authors: Z
authors: Wang
authors: Qiugen
authors: Q
authors: Wang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016267:External Fixators; D005260:Female; D005592:Fracture Fixation / Q000379:methods*; D050723:Fractures, Bone / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000293:injuries*; D011859:Radiography; D012016:Reference Values; D055815:Young Adult