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The cement mantle of femoral hip implants is more influenced by stem-broach sizing than by shape: an in vitro CT analysis of straight Charnley-Kerboul and anatomic Lubinus SPII stems This publication appears in: Archives of Orthopaedic and Trauma Surgery Authors: T. Scheerlinck, J. De Mey and R. Deklerck Volume: 129 Pages: 1473-1481 Publication Year: 2009
Abstract: Introduction: Both, the stem shape and the implantation
technique could influence the quality of the cement mantle
surrounding femoral hip implants. We investigated which
of these two factors is most important for the stem-cement-
bone construct.
Methods: We compared morphological data of 22 straight
Charnley-Kerboul and 18 anatomic Lubinus SPII plastic
replicas implanted line-to-line with the broach or one size
undersized in paired cadaver femora. Specimens were CT
scanned and assessed with validated segmentation software.
Results: According to a general linear model, the canal-
filling capacity of the stem, the cement thickness, the
amount of thin and deficient cement and cortical support to
areas of weak cement, were exclusively related to the
implantation technique. The anatomic shape of Lubinus
stems did not improve centralization or alignment.
Conclusion:Stem shape was the most obvious difference
between Lubinus SPII and Chanrley-Kerboul implants.
However, comparing both, stem-broach sizing was the
most important determining factor for the cemented stem
construct. External Link.
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