title: Stress and stability of plate-screw fixation and screw fixation in the treatment of Schatzker type IV medial tibial plateau fracture: a comparative finite element study.
abstract: OBJECTIVE
  The purpose of this study is to compare the stress and stability of plate-screw fixation and screw fixation in the treatment of Schatzker type IV medial tibial plateau fracture.
  
  
  METHODS
  A three-dimensional (3D) finite element model of the medial tibial plateau fracture (Schatzker type IV fracture) was created. An axial force of 2500 N with a distribution of 60% to the medial compartment was applied to simulate the axial compressive load on an adult knee during single-limb stance. The equivalent von Mises stress, displacement of the model relative to the distal tibia, and displacement of the implants were used as the output measures.
  
  
  RESULTS
  The mean stress value of the plate-screw fixation system was 18.78 MPa, which was significantly (P < 0.001) smaller than that of the screw fixation system. The maximal value of displacement (sum) in the plate-screw fixation system was 2.46 mm, which was lower than that in the screw fixation system (3.91 mm). The peak stress value of the triangular fragment in the plate-screw fixation system model was 42.04 MPa, which was higher than that in the screw fixation model (24.18 MPa). But the mean stress of the triangular fractured fragment in the screw fixation model was significantly higher in terms of equivalent von Mises stress (EVMS), x-axis, and z-axis (P < 0.001).
  
  
  CONCLUSIONS
  This study demonstrated that the load transmission mechanism between plate-screw fixation system and screw fixation system was different and the stability provided by the plate-screw fixation system was superior to the screw fixation system.
authors.affiliation: Shanghai Medical College, Fudan University, Shanghai, China. 13211330003@fudan.edu.cn.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Huang
authors.affiliation: Department of Orthopedics, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, No. 2800 Gongwei Road, Huinan Town, Pudong New Area, Shanghai City, China.
authors.forename: Zhongzheng
authors.initials: Z
authors.lastname: Zhi
authors.affiliation: Department of Orthopedics, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, No. 2800 Gongwei Road, Huinan Town, Pudong New Area, Shanghai City, China. myfirstfea@yahoo.com.
authors.forename: Baoqing
authors.initials: B
authors.lastname: Yu
authors.affiliation: Shanghai Medical College, Fudan University, Shanghai, China. chenfc@126.com.
authors.forename: Fancheng
authors.initials: F
authors.lastname: Chen
mesh_terms: D000328:Adult; D001860:Bone Plates; D001863:Bone Screws; D020342:Finite Element Analysis; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D008297:Male; D008422:Materials Testing / Q000379:methods; D008953:Models, Anatomic; D013314:Stress, Mechanical; D013978:Tibial Fractures / Q000601:surgery*; D016474:Weight-Bearing