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In vitro hip testing in the International Society of Biomechanics coordinate system

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Title: In vitro hip testing in the International Society of Biomechanics coordinate system
Authors: Van arkel, R
Jeffers, J
Item Type: Journal Article
Abstract: Many innovative experiments are designed to answ er research questions about hip biomechanics, however many fail to define a coordinate system. This makes comparisons between studies unreliable and is an unnecessary hurdle in extrapolating experimental results to clinical reality. The aim of this study was to present a specimen mounting protocol which aligns and registers hip specimens in the International Society of Biomechanics (ISB) coordinate system, which is defined by bony landmarks that are identified by palpation of the patient’s body. This wou ld enable direct comparison between experimental testing and clinical gait analysis or radiographic studies. To represent the intact hip, four intact synthetic full - pelves with 8 full - length articulating femora were assembled and digitised to define the IS B coordinate system. Using our proposed protocol, pelvis specimens were bisected into left and right hemi - pelves and femora transected at the mid - shaft, and then mounted in bone pots to represent a typical experimental setup. Anatomical landmarks were re - digitised relative to mechanical features of the bone pots and the misalignment was calculated. The mean misalignment was found to be less than 1.5° flexion/extension, ab/adduction and internal/external rotation for both the pelves and femora; this equate s to less than 2.5 % of a normal range of hip motion. The proposed specimen mounting protocol provides a simple method to align in vitro hip specimens in the ISB coordinate system which enables improved comparison between laboratory testing and clinical s tudies. Engineering drawings are provided to allow others to replicate the simple fixtures used in the protocol.
Issue Date: 29-Oct-2016
Date of Acceptance: 25-Oct-2016
URI: http://hdl.handle.net/10044/1/42178
DOI: https://dx.doi.org/10.1016/j.jbiomech.2016.10.036
ISSN: 1873-2380
Publisher: Elsevier
Start Page: 4154
End Page: 4158
Journal / Book Title: Journal of Biomechanics
Volume: 49
Issue: 16
Copyright Statement: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Wellcome Trust
Engineering & Physical Science Research Council (EPSRC)
Engineering and Physical Sciences Research Council
Funder's Grant Number: 088844/Z/09/Z
EP/K027549/1
EP/N006267/1
Keywords: Science & Technology
Life Sciences & Biomedicine
Technology
Biophysics
Engineering, Biomedical
Engineering
Hip
In vitro
Bone pots
Coordinate system
Reference frame
ACETABULAR LABRUM
CAPSULAR LIGAMENTS
PART 1
JOINT
MOTION
STABILITY
ARTHROPLASTY
CONSTRAINTS
POSITION
RANGE
Biomedical Engineering
0903 Biomedical Engineering
1106 Human Movement And Sports Science
0913 Mechanical Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering



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