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International Orthopaedics
Published in: International Orthopaedics 4/2007

01-08-2007 | Original Paper

Effects of screw eccentricity on the initial stability of the acetabular cup

Authors: Jui-Ting Hsu, Chih-Han Chang, Kai-Nan An, Mark E. Zobitz, Rapin Phimolsarnti, Ronald R. Hugate, Kuo-An Lai

Published in: International Orthopaedics | Issue 4/2007

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Abstract

One of the major failure modes of cementless acetabular components is the loosening of the acetabular cup, which is mostly attributable to insufficient initial stability. A hemispherical cup with a porous coating which is inserted with press-fit fixation and secured with several screws is one of the most widely used approaches. Many studies have found that bone screws are very helpful aids for cup fixation, but the optimal surgical technique for inserting screws has not been clearly reported. In this study, hemispherical cups were fixed into blocks of foam bone with zero to three screws. The effects of three types of screw eccentricity (a 1-mm offset and angular eccentricities of 15° and 25°) on the initial stability of the acetabular cup were evaluated. The experimental results indicate that increasing the number of screws enhances the cup stability in the case of ideal screwing (i.e., with no eccentricity). An angular eccentricity of 15° did not affect the cup stability for fixation with one or two screws. However, the presence of 25° of angular eccentricity significantly reduced the stability of the cup, while 1 mm of offset eccentricity produced an even greater impact.
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Metadata
Title
Effects of screw eccentricity on the initial stability of the acetabular cup
Authors
Jui-Ting Hsu
Chih-Han Chang
Kai-Nan An
Mark E. Zobitz
Rapin Phimolsarnti
Ronald R. Hugate
Kuo-An Lai
Publication date
01-08-2007
Publisher
Springer-Verlag
Published in
International Orthopaedics / Issue 4/2007
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-006-0226-4

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