In vitro biomechanical properties of a hip resurfacing system

Discussion and Conclusions

This biomechanical study showed that the correct positioning of the implant represents a fundamental requirement for the success of any hip resurfacing procedure. The varus positioning of the femoral component increases stress in the superior cortex, while anatomic placement decreases stress across the femoral neck. Notching of the femoral neck during initial cylindrical reaming significantly decreases maximum loading properties of the femoral neck. The femurs with 10° anteversion or retroversion respect to the normal anteversion of the femur did not show a significant decrease of the maximum loading properties on the femoral neck when compared to femurs with anatomically implanted systems.