The X-Bolt: A Biomechanical Study with this New Design Variation of the Dynamic Hip Screw (DHS)
1Centre for Applied Biomedical Engineering Research (CABER), Department of Mechanical and Aeronautical Engineering and Materials and Surface Science, Institute (MSSI), University of Limerick, Ireland.
- *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.
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.