title: Biomechanical outcome of proximal femoral nail antirotation is superior to proximal femoral locking compression plate for reverse oblique intertrochanteric fractures: a biomechanical study of intertrochanteric fractures.
abstract: OBJECTIVE
  Reverse obliquity intertrochanteric fractures are a challenge for orthopedic surgeons. The optimal internal fixation for repairing this type of unstable intertrochanteric fractures remains controversial. This study aimed to compare the biomechanical properties in axial load and cyclical axial load of proximal femoral nail antirotation (PFNA) and proximal femoral locking compression plate (PFLCP) for fixation of reverse obliquity intertrochanteric fractures.
  
  
  METHODS
  Sixteen embalmed cadaver femurs were sawed to simulate reverse obliquity intertrochanteric fracture and instrumented with PFNA or PFLCP. Axial loads and axial cyclic loads were applied to the femoral head by an Instron tester. If the implant-femur constructs did not fail, axial failure load was added to the remaining implant-femur constructs.
  
  
  RESULTS
  Mean axial stiffness for PFNA was 21.10% greater than that of PFLCP. Cyclic axial loading caused significantly less (p=0.022) mean irreversible deformation in PFNA (3.43 mm) than in PFLCP (4.34 mm). Significantly less (p=0.002) mean total deformation was detected in PFNA (6.16 mm) than in PFLCP (8.67 mm).
  
  
  CONCLUSIONS
  For fixing reverse obliquity intertrochanteric fractures, PFNA is superior to PFLCP under axial load.
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Jian-Xiong
authors: JX
authors: Ma
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Jie
authors: J
authors: Wang
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Wei-Guo
authors: WG
authors: Xu
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Jing-Tao
authors: JT
authors: Yu
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Yang
authors: Y
authors: Yang
authors: Biomechanics Labs of Orthopaedic Institute, Tianjin Hospital, Tianjin, China.
authors: Xin-Long
authors: XL
authors: Ma
mesh_terms: D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws; D002102:Cadaver; D005270:Femur Head / Q000601:surgery*; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation*; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans