非骨水泥型股骨柄的轮廓对假体周围初始冯·米塞斯应力分布影响较小。三维有限元分析。
The contour of cementless femoral stem has minor effect on initial periprosthetic von Mises stress distribution. A 3-dimensional finite element analysis.
作者信息
Hu Kong-Zu, Zhang Xian-Long, Wang Cheng-Tao, Ji Wen-Ting
机构信息
Department of Orthopaedic Surgery, the 6th Shanghai People's Hospital, Shanghai Jiaotong University school of Medicine, Shanghai Jiaotong University, Shanghai, PR China.
出版信息
Saudi Med J. 2009 Jul;30(7):947-51.
OBJECTIVE
To evaluate periprosthetic von Mises stress distribution with cementless femoral stems of various contours.
METHODS
The study was carried out at the Department of Orthopaedics, Shanghai 6th Hospital, Shanghai, China between May 2008 and February 2009. Finite element models of proximal femoral replacement with 4 cementless stems (Alloclassic, Ribbed Anatomic, VerSys, and Securi-fit) of various contours were set up. Under the loading conditions of walking and stair climbing, 3-dimensional periprosthetic von Mises stresses were calculated, and the stress distribution patterns were compared.
RESULTS
Periprosthetic stresses were increased in level 1, 2, and 3 under the 2 loading conditions, and more considerably in level 2 and 3. The stresses were higher on the medial side in all cases. No remarkable difference was found in the patterns between the 4 stems.
CONCLUSION
The contour design of femoral stem has minor effect on initial periprosthetic von Mises stress distribution.
目的
评估不同外形的非骨水泥型股骨柄假体周围的米塞斯应力分布情况。
方法
本研究于2008年5月至2009年2月在中国上海第六人民医院骨科进行。建立了近端股骨置换的有限元模型，其中包含4种不同外形的非骨水泥型股骨柄（Alloclassic、带肋解剖型、VerSys和Securi-fit）。在行走和爬楼梯的负荷条件下，计算三维假体周围的米塞斯应力，并比较应力分布模式。
结果
在两种负荷条件下，假体周围应力在1级、2级和3级均有所增加，在2级和3级增加更为明显。所有情况下内侧应力均较高。4种股骨柄之间的模式未发现显著差异。
结论
股骨柄的外形设计对假体周围初始米塞斯应力分布影响较小。
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