The number of screws, bone quality, coefficient affect acetabular cup and friction stability

被引：91

作者：

Hsu, Jui-Ting ^{[1
,2
]}

Chang, Chih-Han ^{[2
]}

Huang, Heng-Li ^{[3
]}

Zobitz, Mark E. ^{[1
]}

Chen, Weng-Pin ^{[4
]}

Lai, Kuo-An ^{[5
]}

An, Kai-Nan ^{[1
]}

机构：

[1] Biomech Lab, Div Orthoped Res, Rochester, MN 55905 USA

[2] Natl Cheng Kung Univ, Inst Biomed Engn, Tainan 701, Taiwan

[3] China Med Univ, Coll Med, Sch Dent, Taichung 404, Taiwan

[4] Chung Yuan Christian Univ, Dept Biomed Engn, Chungli 320, Taiwan

[5] Natl Cheng Kung Univ, Med Ctr, Dept Orthopaed, Tainan 701, Taiwan

来源：

MEDICAL ENGINEERING & PHYSICS | 2007年 / 29卷 / 10期

关键词：

acetabular cup; initial stability; screw fixation; bone quality; coefficient of friction; finite element method;

D O I：

10.1016/j.medengphy.2006.11.005

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

One of the major causes of loosening of cementless acetabular cup implants is insufficient initial stability. This study used three-dimensional finite element models of the pelvis and acetabular components to investigate the effects of the number of screws, bone quality, and friction coefficient of the acetabular cup on the initial stability under normal walking. A commercially available hemispherical acetabular cup with five screw holes was used as the default model. The stiffness of the pelvis and the friction coefficient of the cup were systematically varied, within a realistic range, to assess the initial stability of the acetabular cup. The simulations showed that the inserted screws provide only a localized reduction in the relative micromotion between the cup and pelvis therefore inserting several screw closed together might not be useful. Changes in the pelvic stiffness have a non-linear effect on the initial stability of acetabular cup and the subchondral bone provides good support for fixation of the cementless cup. The friction coefficient of the acetabular cup plays a limited role, comparing with the factor of bone quality, in resisting relative micromotion in the cup-pelvis interface. (C) 2006 IPEM. Published by Elsevier Ltd. All rights reserved.

引用

页码：1089 / 1095

页数：7

共 25 条

[1] Hip contact forces and gait patterns from routine activities [J].