Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness

JunFen Shi, Martin Browne, Michael Strickland, Gunnar Flivik, Mark Taylor

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Patient-specific finite element models of the implanted proximal femur can be built from pre-operative computed tomography scans and post-operative X-rays. However, estimating three-dimensional positioning from two-dimensional radiographs introduces uncertainty in the implant position. Further, accurately measuring the thin cement mantle and the degree of cement-bone interdigitation from imaging data is challenging. To quantify the effect of these uncertainties in stem position and cement thickness, a sensitivity study was performed. A design-of-experiment study was implemented, simulating both gait and stair ascent. Cement mantle stresses and bone-implant interface strains were monitored. The results show that small variations in alignment affect the implant biomechanics, especially around the most proximal and most distal ends of the stem. The results suggest that implant position is more influential than cement thickness. Rotation around the medial-lateral axis is the dominant factor in the proximal zones and stem translations are the dominant factors around the distal tip.

    Original languageEnglish
    Pages (from-to)1671-1684
    Number of pages14
    JournalComputer Methods in Biomechanics and Biomedical Engineering
    Volume17
    Issue number15
    DOIs
    Publication statusPublished - Nov 2014

    Keywords

    • design-of-experiment
    • finite element analysis
    • implant alignment
    • sensitivity
    • total hip replacement

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