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3D computer modeling analysis of the surface area and thread volume of the common sliding hip screw

Lee, Paul, Eggbeer, Dominic, Gardner, Andrew and Ryan, Michael 2017. 3D computer modeling analysis of the surface area and thread volume of the common sliding hip screw. Orthopedics and Rheumatology 5 (1) , pp. 1-5. 10.19080/OROAJ.2017.05.555653

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Abstract

Introduction: The Sliding Hip Screw (SHS) is a tried and tested method used to treat intertrochanteric hip fractures. Lag screw cut-out is a major complication of SHS fixation and accepted risk factors are often re-evaluated. We aim to demonstrate a new hypothesis of cut-out using 3D reconstructive modelling. We propose that the risk of cut-out is much greater in lag screws with a smaller thread surface area and larger thread volume. Method: The four commonly used SHS lag screw systems (Biomet, Synthes, Stryker and Smith & Nephew) were CT scanned and the images processed and turned into 3D computer models for further analysis. Results: There were sign I can’t differences between the surface area and thread volumes of the lag screws between manufacturers ranging from 67.0mm2 - 347.4 mm2 and 166.376mm3 - 225.687mm3 respectively. Discussion: Assuming the consistency of bone is equal, we propose that the risk of cut-out is much greater in lag screws with a smaller surface area to thread volume ratio (SA:TV). The reamer design of lag screws is also discussed. Conclusion: Although there are many non-modi iable risk factors that contribute to screw cut-out, selecting the right raw materials for SHS fixation will have a favorable impact on the overall risk.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Business (Including Economics)
Publisher: Juniper Publishers
ISSN: 2471-6804
Date of First Compliant Deposit: 24 July 2018
Date of Acceptance: 27 February 2017
Last Modified: 25 Jul 2020 15:35
URI: http://orca.cf.ac.uk/id/eprint/103584

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