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，其中频率最高的是扭转振动。扭振检测最灵敏的方法是。当加速度计放置在股骨的近端或远端时，振幅更高。研究发现，股骨颈的机械强度与扭转振动频率有关。对股骨的有限元分析表明，股骨颈前下部存在压应力集中，股骨后上部存在拉应力集中。在此基础上研制了基于振动响应分析的股骨颈骨折诊断仪。

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.