Effect of the support systems' compliance on total hip modular taper seating stability

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Laura Y SchollJim Nevelos

Abstract

Assembly of a femoral head onto the stem remains non-standardized. The literature shows altering mechanical conditions during seating affects taper strength and lower assembly load may increase fretting corrosion during cyclic tests. This suggests overall performance may be affected by head assembly method. The purpose of this test was to perform bench-top studies to determine influence of peak force magnitude, load rate, and compliance of the system's support structure on initial stability of the taper. Custom manufactured CoCrMo femoral heads and Ti-6Al-4V taper analog samples were assembled with varying peak force magnitudes (2-10.1 kN), load rates (quasi-static vs impaction), and system compliance (rigid vs compliant). A clinically-relevant system compliance design was based off of force data collected during a cadaver impaction study. Tensile loads were then applied to disassemble the taper and quantify initial taper stability. Results indicated that taper stability (assessed by disassembly forces) increased linearly with assembly force and load rate did not have a significant effect on taper stability. When considering system compliance, a 42%-50% larger input energy, dependent on assembly force, was required in the compl...Continue Reading

References

Feb 24, 2001·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·W MacdonaldL V Carlsson
Sep 7, 2002·The Journal of Arthroplasty·Andrew T PennockCraig A Bourgeault
Dec 23, 2003·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·A WangG Schmidig
Jan 26, 2006·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Matthew L MroczkowskiCheryl R Blanchard
Aug 19, 2006·Biomedizinische Technik. Biomedical Engineering·Roman NassuttHans Grundei
Aug 3, 2010·Medical Engineering & Physics·Travis BurgersHeidi-Lynn Ploeg
Oct 17, 2014·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Selin MunirWilliam Robert Walsh
Jul 3, 2015·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Timothy M BrockDavid J Langton
Apr 24, 2016·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Laura SchollJim Nevelos
May 14, 2016·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Henning HaschkeMichael M Morlock

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Methods Mentioned

BETA
total hip arthroplasties
pull-off

Software Mentioned

SAS

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