CAJ | 학술논문

目的探讨髋关节表面置换术后股骨近端在人体步态运动过程中受冲击载荷作用时的应力分布.方法选择4名行金属对金属髋关节表面置换(均应用DuromTM髋关节表面置换系统假体)术后志愿者,利用64排螺旋CT对志愿者髋臼、股骨近端及假体进行扫描,采用Mimics、Abaqus软件重建金属对金属髋关节表面置换术后有限元模型,模拟股骨在膝关节完全固定(人体站立相)下的静力影响,同时采用冲击载荷对髋关节进行试验,比较冲击载荷对股骨的不同作用效果,以及股骨在冲击载荷作用下的力学特性.结果在500 N载荷作用下静载的应力峰值(5.21 MPa)大于冲击载荷应力峰值(1.89 MPa).从分布区域看,静载的峰值应力与冲击载荷的分布相同,都位于股骨颈周围区域.髋关节表面置换术后股骨头颈交界处应力较其他区域减少21％～76％,出现明显的应力遮挡,应力峰值存在于股骨颈基底部.结论髋关节表面置换术后在冲击载荷作用下,高应力存在于股骨颈基底部,股骨头颈交界处应力遮挡明显.
목적 탐토관관절표면치환술후고골근단재인체보태운동과정중수충격재하작용시적응력분포.방법 선택4명행금속대금속관관절표면치환(균응용DuromTM관관절표면치환계통가체)술후지원자,이용64배라선CT대지원자관구、고골근단급가체진행소묘,채용Mimics、Abaqus연건중건금속대금속관관절표면치환술후유한원모형,모의고골재슬관절완전고정(인체참립상)하적정력영향,동시채용충격재하대관관절진행시험,비교충격재하대고골적불동작용효과,이급고골재충격재하작용하적역학특성.결과 재500 N재하작용하정재적응력봉치(5.21 MPa)대우충격재하응력봉치(1.89 MPa).종분포구역간,정재적봉치응력여충격재하적분포상동,도위우고골경주위구역.관관절표면치환술후고골두경교계처응력교기타구역감소21％～76％,출현명현적응력차당,응력봉치존재우고골경기저부.결론 관관절표면치환술후재충격재하작용하,고응력존재우고골경기저부,고골두경교계처응력차당명현.
Objective To analyze the stress distribution at the femoral neck during human gait cycle under impact force following the hip resurfacing arthroplasty.Methods A three-dimensional finite element model of hip resurfacing arthroplasty (DuromTM hip prosthesis) was reconstructed using software Mimics and Abaqus on the basis of the dataset of patients undergoing hip resurfacing arthroplasty.The distal femur was fixed to simulate the impact of a static force of 500 N on the hip prosthesis at a standing position and an impulsive force of 500 N was also simulated on the hip prosthesis.Different effects of impact forces on the femur were compared and the mechanics of the femur under impact force was characterized.Results The peak stress under a 500 N static force was greater than that under a same impulsive force (5.21 MPa versus 1.89 MPa).The stress range under the impulsive force was similar to that under a static force,distributing around the femoral neck.The stress at the junction of the femoral head and neck decreased by 21％ to 76％ compared with other regions,indicating obvious stress shields at this region.The peak stress was present in the lower femoral neck.Conclusion After hip resurfacing arthroplasty a high stress may distribute in the lower femoral neck under an impulsive force,with obvious stress shielding at the femoral head-neck junction.