title: Experimental study on treatment of acetabular anterior column fractures: applyment of a minimally invasive percutaneous lag screw guide apparatus.
abstract: BACKGROUND
  The aim of this study was to design a new minimally invasive percutaneous lag screw guide apparatus and to verify its adjuvant treatment of acetabular anterior column fracture on pelvis specimens.
  
  
  METHODS
  This guide apparatus was self-developed based on the principles of "two points form a line" and "Rectangle". Using C-arm fluoroscopy, this guide apparatus was used to conduct minimally invasive percutaneous lag screw internal fixation of acetabular anterior column fractures. Ten hollow lag screws were placed into 5 pelvis specimens.
  
  
  RESULTS
  Result showed no sign of any screws puncturing the cortex or entering into the hip joint on radiological assessment. The cross-section reconstructed vertical distance to the screw, on the cross-section acetabular notch and the cross-section of the screw where the distance of between the screw and the iliopectineal line's arc roof was at its shortest, indicate that at all points (T, R-r) under the line with an inclination of 1 (namely T = R-r) the screw is within the cortex and does not puncture the acetabula anterior column or enter into the hip joint.
  
  
  CONCLUSIONS
  We may conclude that this self-developed guide apparatus solves the screw precision problem during the treatment of acetabular anterior column fractures through a minimally invasive percutaneous lag screw.
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. zhanglihai301@gmail.com.
authors.forename: Li-hai
authors.initials: LH
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. zhanglcheng218@126.com.
authors.forename: Li-cheng
authors.initials: LC
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. qihuasi@126.com.
authors.forename: Qing-hua
authors.initials: QH
authors.lastname: Si
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. gaoyuanzd@163.com.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. xiuyunsu@gmail.com.|Department of Orthopedics, Affiliated Hospital of the Academy of Military Medical Sciences, No.8 Dongdajie Road, Beijing, 100071, People's Republic of China. xiuyunsu@gmail.com.
authors.forename: Xiu-yun
authors.initials: XY
authors.lastname: Su
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. zhaozhao_02@163.com.|Department of Orthopedics, Beijing Tsinghua Chang Gung Hospital, No.1 Block Tiantongyuan North, Beijing, 102218, People's Republic of China. zhaozhao_02@163.com.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Department of Orthopedics, Chinese PLA General Hospital, No.28 Fuxing Road, Haidian District, Beijing, 100853, People's Republic of China. pftang301@163.com.
authors.forename: Pei-fu
authors.initials: PF
authors.lastname: Tang
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000293:injuries* / Q000601:surgery*; D001863:Bone Screws; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D050723:Fractures, Bone / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation* / Q000379:methods; D011859:Radiography; D016896:Treatment Outcome