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The loading patterns of a short femoral stem in total hip arthroplasty: gait analysis at increasing walking speeds and inclines.

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Title: The loading patterns of a short femoral stem in total hip arthroplasty: gait analysis at increasing walking speeds and inclines.
Authors: Wiik, AV
Brevadt, M
Johal, H
Logishetty, K
Boughton, O
Aqil, A
Cobb, JP
Item Type: Journal Article
Abstract: BACKGROUND: The purpose of this study was to examine the gait pattern of total hip arthroplasty (THA) patients with a new short femoral stem at different speeds and inclinations. MATERIALS AND METHODS: A total of 40 unilateral THA patients were tested on an instrumented treadmill. They comprised two groups (shorter stemmed THA n = 20, longer stemmed THA n = 20), both which had the same surgical posterior approach. The shorter femoral stemmed patients were taken from an ongoing hip trial with minimum 12 months postop. The comparative longer THR group with similar disease and severity were taken from a gait database along with a demographically similar group of healthy controls (n = 35). All subjects were tested through their entire range of gait speeds and inclines with ground reaction forces collected. Body weight scaling was applied and a symmetry index to compare the implanted hip to the contralateral normal hip. An analysis of variance with significance set at α = 0.05 was used. RESULTS: The experimental groups were matched demographically and implant groups for patient reported outcome measures and radiological disease. Both THA groups walked slower than controls, but symmetry at all intervals for all groups were not significantly different. Push-off loading was less favourable for both the shorter and longer stemmed THR groups (p < 0.05) depending on speed. CONCLUSIONS: Irrespective of femoral stem length, symmetry for ground reaction forces for both THA groups were returned to a normal range when compared to controls. However individual implant performance showed inferior (p < 0.05) push-off forces and normalised step length in both THR groups when compared to controls. LEVEL OF EVIDENCE: III.
Issue Date: 17-Aug-2018
Date of Acceptance: 13-Mar-2018
URI: http://hdl.handle.net/10044/1/61965
DOI: https://dx.doi.org/10.1186/s10195-018-0504-0
ISSN: 1590-9921
Publisher: Springer
Journal / Book Title: Journal of Orthopaedics and Traumatology
Volume: 19
Issue: 1
Copyright Statement: © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Sponsor/Funder: Imperial College Healthcare NHS Trust- BRC Funding
Engineering & Physical Science Research Council (E
Royal College Of Surgeons Of England
Funder's Grant Number: RDB04 79560
Keywords: Gait
Hip arthroplasty
Weight acceptance
Publication Status: Published
Conference Place: Italy
Article Number: ARTN 14
Appears in Collections:Department of Surgery and Cancer