Biomechanical changes of proximal femur for posteriomedial fractures:a finite element analysis / 中国矫形外科杂志

ABSTRACT

[Objective]To research the biomechanical influence of posteriomedial fractures on proximal femur.[Method]Three dimensional finite element models of intact and osteotomied proximal femurs were established from computerized tomographic(CT)scanning images,and finite element analysis was undertaken.[Result]The maximum equivalent stress was located at the anteriomedial of the defection of the proximal femur.The stress of femoral neck,as well as the medial and lateral femoral cortex was not significantly changed after isolated lesser trochanteric fracture.However,with half of the medial cortex involved,the stress of the medial and lateral femur increased by 47% and 12%,respectively.If the entire medial cortex was involved,the stress of medial and lateral femur increased by 247% and 66%,respectively.[Conclusion]Different types of posteriomedial fragments have different effects on the stress distribution and quantity of proximal femur.When treating intertrochanteric fractures using dynamical hip screw,the fragments should be differently treated based on its types considering for biomechanical effects.