title: Biomechanical comparison of antirotator compression hip screw and cannulated screw fixations in the femoral neck fractures.
abstract: OBJECTIVE
  The aim of this study was to compare the biomechanical properties of minimal invasive sliding antirotator compressive hip screw (MIS-A-CHS), and multiple cannulated screws (CS) on a Pauwels type 3 femoral neck fracture model.
  
  
  METHODS
  A Pauwels type 3 vertical femoral neck fractures was created on 12 third-generation proximal femur models which were divided into two equal groups. The fracture was fixed with three CS in the first group, and MIS-A-CHS in the second group. The axial and rotational stiffness and maximum compression effect were compared between the groups.
  
  
  RESULTS
  The axial and rotational stiffness and maximum compression were significantly higher in MIS-A-CHS group (912.5 N, 540 N and 10.2 N/m, respectively) than the CS group (627.5 N, 380 N, and 3.9 N/m, respectively).
  
  
  CONCLUSIONS
  MIS-A-CHS appears to be a more secure fixation method in Pauwels type 3 femoral neck fractures than the CS.
authors.affiliation: Department of Orthopedics and Traumatology, Ümraniye Training and Research Hospital, İstanbul, Turkey. necdetsaglam@hotmail.com.
authors.forename: Necdet
authors.initials: N
authors.lastname: Sağlam
authors.affiliation: Department of Orthopedics and Traumatology, Bezmialem Vakıf University, Faculty of Medicine, İstanbul, Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Küçükdurmaz
authors.affiliation: Department of Orthopedics and Traumatology, İstanbul Training and Research Hospital, İstanbul, Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Kivilcim
authors.affiliation: Department of Orthopedics and Traumatology, Ümraniye Training and Research Hospital, İstanbul, Turkey.
authors.forename: Tuhan
authors.initials: T
authors.lastname: Kurtulmuş
authors.affiliation: Department of Orthopedics and Traumatology, Bezmialem Vakıf University, Faculty of Medicine, İstanbul, Turkey.
authors.forename: Cengiz
authors.initials: C
authors.lastname: Sen
authors.affiliation: Department of Orthopedics and Traumatology, Abant İzzet Baysal University, Faculty of Medicine, Bolu, Turkey.
authors.forename: Fuat
authors.initials: F
authors.lastname: Akpinar
mesh_terms: D001696:Biomechanical Phenomena; D001863:Bone Screws / Q000145:classification / Q000592:standards; D057186:Comparative Effectiveness Research; D019544:Equipment Failure Analysis; D005265:Femoral Neck Fractures / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods; D006621:Hip Joint / Q000502:physiology / Q000601:surgery; D006801:Humans; D008422:Materials Testing / Q000379:methods; D008953:Models, Anatomic; D019415:Torque; D016474:Weight-Bearing