CAJ | 학술논문

目的:分析假体植入带来的力学变化导致远端微动的原因,以利于进一步对假体设计和选材及假体临床效果等多因素进行理论分析.方法:通过数学力学推导,假设股骨和假体柄为完全结合的同心圆柱体,建立了一个相对完善的界面应力传递理论模型,获得了界面剪切应力和径向应力随Z位置变化的分布.结果:界面最大的剪应力发生在z＝0处,即股骨颈的截面上,当z＞0.1 m时剪应力非常小,即股骨柄远端剪应力非常小;界面的径向应力随股骨柄长度Z的增加而加大,当z＞0.05 m时,径向应力几乎不变,即股骨柄远端的径向应力大.结论:股骨假体远端微动由径向应力引起.
목적:분석가체식입대래적역학변화도치원단미동적원인,이리우진일보대가체설계화선재급가체림상효과등다인소진행이론분석.방법:통과수학역학추도,가설고골화가체병위완전결합적동심원주체,건립료일개상대완선적계면응력전체이론모형,획득료계면전절응력화경향응력수Z위치변화적분포.결과:계면최대적전응력발생재z＝0처,즉고골경적절면상,당z＞0.1 m시전응력비상소,즉고골병원단전응력비상소;계면적경향응력수고골병장도Z적증가이가대,당z＞0.05 m시,경향응력궤호불변,즉고골병원단적경향응력대.결론:고골가체원단미동유경향응력인기.
Objective: To investigate possible causes of micromotion in distal femoral prosthesis. Methods: Based on the assumption that the femur and prosthesis were considered as concentric cylinders with completely bonded interface,a theoretical mode1 simulating the interfacia1 stress transfer was established.The distributions of the interfacia1 shear and radial stresses with the changing of z were obtained through mathematics and mechanics deducing. Results: The maximum interfacial shear stress occured at the position of z＝0,namely,the cross section of the femur neck.The interfacia1 shear stress sharply decreased with the increasing of z and came to nearly zero at the range of z＞0.1 m.While the interfacial radial stress increased with the increasing of z,at the range of z＞0.05 m it was constant and reached the maximum. Conclusion: The micromotion in distal prosthesis is caused by the interfacial radial stress.