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Finite Element Analysis of Fixation Device for Femoral Neck Fracture: Dynamic Hip Screw

Hamed Reza Seyyed Hosseinzadeh PhD1*, Mohamad Qoreishy MD2, Ali Sina Shahi MD3

1 Amirkabir University of Technology, Tehran, Iran
2 Shahid Beheshti University of Medical Sciences, Tehran, Iran
3 Rothman Institute, Philadelphia, PA, USA
* Corresponding Author

Femoral neck fracture is one of the most common fractures in the elderly patients. Beside its commonness, treatment of these fractures make great challenges to orthopedic surgeons. One of the methods for treatment of femur neck fractures is fixation with dynamic hip screw (DHS). Dynamic hip screw is a device for fixing the fractures of the proximal femur, esp, intertrochantric fractures. Since there is great challenge in fixing these fractures using cannulated screws, DHS is now being used more frequently in treating these fractures. In this research, stress distribution in this device was reproduced by computer simulation. In addition, overall performance of this device is also explained and tried to disclose parts of this device carrying more stress during application in human body.

According to the calculated results, it was confirmed that mean stress in dynamic hip screw (lower than 70 MPa) and femur (lower than 48 MPa) in reasonably less than yield point of bone and implant grade stainless steel and also fixation device carries more stresses than femur. In addition, overall displacement of femoral neck fracture fixed by dynamic hip screw is as order of micrometer.

Keywords: Dynamic Hip Screw, Finite element Analysis, Femoral Neck Fracture, Fixation Device, Orthopedic Surgery