DEVELOPMENT OF DIAGNOSTIC EQUIPMENT FOR PREDICTION OF FEMORAL NECK FRACTURE USING VIBRATIONAL RESPONSE ANALYSIS

在人体股骨中发现了三种主要的振动模式，其中频率最高的模式是扭转振动。扭转振动的检测灵敏度最高。当加速计放置在股骨的近端或远端时，振幅更高。股骨颈的力学强度与扭转振动频率相关。股骨有限元分析表明，股骨颈前下方存在压应力集中，后上方存在拉应力集中。基于上述发现，制造了一种利用振动响应分析预测股骨颈骨折的诊断设备。

Three primary vibrational modes were found in the human femur, of which the mode with the highest frequency is a torsional vibration. The torsional vibration could be detected most sensitively with. higher amplitude when an accelerometer is placed either at the proximal or distal end of the femur. The mechanical strength of the femoral neck is found to be correlative to the torsional vibrational frequency. A finite element method analysis of the femur revealed that a compressive stress concentration existed in the antro-inferior area of the femoral neck and a tensile stress concentration did in the postero-superior area. A diagnostic equipment for prediction of femoral neck fracture using vibrational response analysis was manufactured based upon the above findings.