CAJ | 학술논문

目的利用三维有限元分析法评估老年患者不同股骨偏心距( femoral offset,FO)对骨水泥全髋关节置换术(total hip arthroplasty,THA)中应力水平的影响. 方法对2例正常双髋关节用CT图像进行影像学测定,参数包括FO、颈干角和颈长.建立三维有限元模型,对THA中不同颈长、颈干角和FO的变化进行Von Mises应力分析. 结果假体和骨水泥上应力随着颈干角的增加而单调下降,颈长在35 ～44 mm范围内,假体和骨水泥上应力水平较低,超过这一范围应力水平单调上升. 结论降低假体和骨水泥上的应力、提高股骨上的应力及增加髋关节活动范围与FO密切相关.重建FO有利于恢复外展肌力臂及正常髋关节的生物力学功能.
목적 이용삼유유한원분석법평고노년환자불동고골편심거( femoral offset,FO)대골수니전관관절치환술(total hip arthroplasty,THA)중응력수평적영향. 방법 대2례정상쌍관관절용CT도상진행영상학측정,삼수포괄FO、경간각화경장.건립삼유유한원모형,대THA중불동경장、경간각화FO적변화진행Von Mises응력분석. 결과 가체화골수니상응력수착경간각적증가이단조하강,경장재35 ～44 mm범위내,가체화골수니상응력수평교저,초과저일범위응력수평단조상승. 결론 강저가체화골수니상적응력、제고고골상적응력급증가관관절활동범위여FO밀절상관.중건FO유리우회복외전기역비급정상관관절적생물역학공능.
Objective To evaluate the effects of femoral offset (FO) on the stress level of bone cement total hip arthroplasty (THA) in the elder patients by the three-dimensional finite element analysis. Methods The normal bilateral hip joints in two cases was determined with CT imaging,with parameters including FO,neck shaft angle and neck length.The three-dimensional finite element model of THA was built so as to make Von Mises stress analysis of the changes of different neck lengths,neck shaft angles and FO. Results Stress levels in the prosthesis and bone cement reduced monotonically with the increase of neck shaft angles.In the meantime,the stress levels were lowered when neck length was in a range of 35-44 mm,but beyond the range they showed monotonous increase. Conclusions The reduction of stress levels of prosthesis and bone cement,promotion of femur stress and extension of range of motion of hip joints are closely related to FO.FO reconstruction benefits the restoration of abductor force arm and biomechanical function of normal hip joints.