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Influence of stem geometry on mechanics of cemented femoral hip components with a proximal bond
Author(s) -
Mann Kenneth A.,
Bartel Donald L.,
Ayers David C.
Publication year - 1997
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.1100150511
Subject(s) - cement , materials science , ultimate tensile strength , stem cell , composite material , biology , microbiology and biotechnology
Nonlinear, three‐dimensional, finite element models of cemented femoral hip components with a proximal stem‐Cement bond were developed with use of a Charnley stem geometry and a modified Charnley stem geometry that had a cylindrical cross section over the distal two‐thirds of the stem (Distal‐Round). Peak tensile stresses in the proximal cement mantle increased 63 and 74% for the Charnley and Distal‐Round stems, respectively, when the proximal stem‐cement interface was debonded, The shear stresses over the stem‐cement interface with a proximal bond were 29%. larger for the Distal‐Round stem than for the Charnley stem. After the proximal stem‐cement interface was debonded. the peak tensile stresses in the cement mantle were 15% larger for the Distal‐Round stem than for the Charnley stem. The results illustrate that stresses within the proximal cement mantle could be substantially reduced for both Charnley and Distal‐Round stems through use of a proximal stem‐cement bond. However, the risk of debonding may be higher for the Distal‐Round stem because of increased shear stresses, and once debonded the risk of further loosening due to failure of the cement mantle would also be higher for the Distal‐Round stem.