Stress analysis of pertrochanteric fractures with different fixation devices--behavior under muscle forces and...

The author examined the stress analysis with the strain measuring method on femoral models. We applied static loading with the muscle forces on the frontal plane in a one-legged stance. The results showed that the distribution of the stresses on the surface of the fractured femur revealed an extreme change--"protection phenomenon" at the fracture site in the nail plate group more than in the Ender nails. This may indicate the main transition of the bending force through the devices, resulting in fatigue fracture or breakage of the devices clinically.