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ISSN: 2155-9538

Journal of Bioengineering & Biomedical Science
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Research Article

The X-Bolt: A Biomechanical Study with this New Design Variation of the Dynamic Hip Screw (DHS)

Francis O'Neill1*, McGloughlin T2, Coffey JC3, Walsh M4, Condon F5 and Lenehan B5

1Centre for Applied Biomedical Engineering Research (CABER), Department of Mechanical and Aeronautical Engineering and Materials and Surface Science, Institute (MSSI), University of Limerick, Ireland.

2National University of Ireland, M.Eng Sc, National University of Ireland, Ph.D. Trinity College Dublin

3Department of Surgery, Consultant General and Colorectal Surgeon, Graduate Entry Medical School, University of Limerick, MidWestern Regional hospitals, Limerick, Ireland

4Doctor of Philosophy (Mechanical Engineering), University of Limerick, Bachelor of Engineering, (Mechanical), University of Limerick

5Consultant Orthopaedic Surgeon, Midwestern Regional, Orthopaedic Hospital Croom / Midwestern Regional Hospital, Dooradoyle Limerick

*Corresponding Author:
Francis O’Neill
Mb Bch MRSCI, Aughavoona House
Garryspillane, Co Limerick, Ireland
Tel: 087 7550420
E-mail: [email protected]

Received Date: November 14, 2011; Accepted Date: December 30, 2011; Published Date: December 30, 2011

Citation: O'Neill F, McGloughlin T, Coffey JC, Walsh M, Condon F, et al. (2012) The X-Bolt: A Biomechanical Study with this New Design Variation of the Dynamic Hip Screw (DHS). J Bioeng Biomed Sci 2:110. doi:10.4172/2155-9538.1000110

Copyright: © 2012 O'Neill F et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Objective:The objective of this study was to test a newly developed implant for the treatment of intertrochanteric fractures, the X-Bolt, against the current gold standard, the Dynamic Hip Screw (DHS), by comparing the amount of energy required to cause failure of both of them.

Methods:Push out studies were performed with both the dynamic hip screw and the X-Bolt in an artificial bone substrate in the form of polyurethane foam blocks, which have predefined mechanical properties. These push out studies were performed as a means to investigate each implants resistance to ‘cut out’ as this is the most common mode of failure with the DHS.

Results: The results demonstrate that the X-Bolt produced a force displacement curve with a different pattern of failure than the DHS. The X-Bolt initially required less energy to move it within the test material, than the DHS. However, the further the X-Bolt advanced within the test material, the greater the resistance and as this was the opposite as to what occurred with the DHS, the X-Bolt eventually required more energy than the DHS to advance through the test material and fail due ‘cut out’.

Conclusion:The X-Bolt is a new concept with regard to fixation of intertrochanteric fractures. It produces a different force displacement curve than the dynamic hip screw. However further investigations are necessary before the true potential of this new implant is known.

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