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 ORCID: https://orcid.org/0000-0002-8104-0121 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:	12 May 2024 01:05
URI:	https://orca.cardiff.ac.uk/id/eprint/103584

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