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< Vol. 12 Issue 2 | May-Aug 2014 | pp. 65 - 112

Interfacial sliding properties of bone screw materials and their effect on screw fixation strength

Abstract

Background: This study examined the effect of interfacial sliding and test material properties on the fixation strength and insertional properties of self-tapping bone screws. Various substitute materials (polyacetal [POM], poly(methyl methacrylate) [PMMA] and E-glass-filled Epoxy [Sawbones®]) for human bone were evaluated, and the results were compared with the findings for cadaver bone.
Methods: Initial coefficient of friction (CoF) of the screw material stainless steel AISI316 was tested using a pin-on-disk apparatus, and the screws were exposed to pullout tests after insertion torque tests. The effect of a smooth diamond-like carbon (DLC) coating was studied by applying the coating on both CoF test balls and bone screws.
Results: Mechanical properties of test blocks strongly correlated to both pullout strength and insertion torque of the screws: for noncoated 2.7-mm screws, tensile strength correlated to pullout strength and insertion torque, with Pearson correlation coefficients r=0.977 and r=0.738, respectively. In contrast, CoF correlated strongly to screw insertion torque but not to pullout strength in bone substitute materials (for noncoated 2.7-mm screws, r=0.652 and r=0.248, respectively). There were no significant differences in CoF using noncoated and DLC-coated screw materials against bone substitutes.
Conclusions: Proper materials for in vitro testing help in evaluating the biomechanics of the implants in advance. However, choosing the material needs attention, as their ability to model human bone depends on test type.

J Appl Biomater Funct Mater 2014; 12(2): 90 - 96

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/JABFM.5000177

Authors

Arto P. Koistinen, Hannu Korhonen, Heikki Kröger, Reijo Lappalainen

Article History

  • • Accepted on 08/12/2012
  • • Available online on 13/01/2014
  • • Published online on 05/09/2014

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Authors

  • Koistinen, Arto P. [PubMed] [Google Scholar]
    Department of Applied Physics, University of Eastern Finland, Kuopio - Finland and SIB Labs, University of Eastern Finland, Kuopio - Finland
  • Korhonen, Hannu [PubMed] [Google Scholar]
    Department of Applied Physics, University of Eastern Finland, Kuopio - Finland
  • Kröger, Heikki [PubMed] [Google Scholar]
    Department of Orthopaedics, Traumatology and Handsurgery, Kuopio University Hospital, Kuopio - Finland
  • Lappalainen, Reijo [PubMed] [Google Scholar]
    Department of Applied Physics, University of Eastern Finland, Kuopio - Finland and SIB Labs, University of Eastern Finland, Kuopio - Finland

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