Biomechanical Performance between Single and Double Lag Screw Trochanteric Gamma Nail used to Stabilize Femoral Neck Fracture: A Finite Element Study
Keywords:trochanteric gamma nail, double lag screw, femoral neck fractures, finite element analysis
This study was conducted to compare a biomechanical performance between trochanteric gamma nail with single lag screw and double lag screw in the treatment of femoral neck fracture and femoral neck fracture without lesser trochanter. A 3D model of Thai femur was reconstructed from computed tomography spiral scanner whereas a trochanteric gamma nail was reconstructed with the data obtained from 3D laser scanner. A virtual insertion of the nail and femur was done by computer aided design (CAD) software before imported to finite element analysis. The FE models were analysed in the early stage of fracture. Von Mises stress of implant and elastic strain of fracture were observed for each cases. The results showed that a double lag screw provided a better biomechanical performance in femoral neck fracture, especially in femoral neck fracture without lesser trochanter. According to the results, a double lag screw had a lower von Mises stress value on the implant compared to a single lag screw. The elastic strain showed a low value in all double lag screw cases, indicated that a double lag screw produced higher fracture stability.
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