Comparison of the biomechanical effects of pertrochanteric fixator and dynamic hip screw on an intertrochanteric femoral fracture using the finite element method.
BACKGROUND
This study was conducted to examine and compare the pertrochanteric fixator (PTF) and dynamic hip screw (DHS).


METHODS
AnsysWorkbench, a commercial finite element based program, was used to investigate the biomechanical parameters of femoral fractures and implants. The human femoral model was scanned and a femoral intertrochanteric fracture was created. Von Mises stress, von Mises strain, and shear and deformation forces on the upper and lower parts of the fracture line; and the von Mises stress, von Mises strain parameters of the screws and implant bodies during axial loading were calculated and compared.


RESULTS
It was determined that the magnitude of displacement forces along the fracture line was lower in PTF. Regarding the von Mises stress and von Mises strain values on the implant bodies, the DHS body had higher levels compared with the PTF body.


CONCLUSIONS
This study demonstrated that PTF is more favorable than DHS for early axial loading and ambulation.
Dumlupinar University, School of Medicine, Department of Orthopaedic Surgery, Campus of Evliya Celebi, 43100, Kutahya, Turkey.
Sermet
S
Inal
Ferruh
F
Taspinar
Eyyup
E
Gulbandilar
Kadir
K
Gok
D001696:Biomechanical Phenomena; D001863:Bone Screws; D003198:Computer Simulation; D020342:Finite Element Analysis; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006620:Hip Fractures / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008954:Models, Biological; D012984:Software; D013314:Stress, Mechanical
Intertrochanteric fractures; devices; dynamic hip screw; external fixator