Stresses in cement mantles of hip replacements: effect of femoral implant sizes, body mass index and bone quality

J.-M.S. Lamvohee, R. Mootanah, P. Ingle, K. Cheah and J.K. Dowell

Computer Methods in Biomechanics and Biomedical Engineering, 2009, vol. 12, issue 5, 501-510

Abstract: The effects of femoral prosthetic heads of diameters 22 and 28 mm were investigated on the stability of reconstructed hemi-pelves with cement mantles of thicknesses 1–4 mm and different bone qualities. Materialise medical imaging package and I-Deas finite element (FE) software were used to create accurate geometry of a hemi-pelvis from CT-scan images. Our FE results show an increase in cement mantle stresses associated with the larger femoral head. When a 22 mm femoral head is used on acetabulae of diameters 56 mm and above, the probability of survivorship can be increased by creating a cement mantle of at least 1 mm thick. However, when a 28 mm femoral head is used, a cement mantle thickness of at least 4 mm is needed. Poor bone quality resulted in an average 45% increase in the tensile stresses of the cement mantles, indicating resulting poor survivorship rate.

Date: 2009
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DOI: 10.1080/10255840902718626

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