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首页> 外文期刊>Journal of Biomechanics >In vivo glenohumeral translation under anterior loading in an open-MRI set-up
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In vivo glenohumeral translation under anterior loading in an open-MRI set-up

机译：在开放式MRI设置中的前载下体内Glenohumeral翻译

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摘要

The evaluation of the glenohumeral joint laxity requires the estimate of displacements of the humeral head centre (HHC) with respect to the glenoid. To the authors' knowledge, several studies have been conducted to estimate HHC translations in vivo but data under anterior loading conditions has not been collected yet. Aim of this study was to develop a non-invasive experimental methodology based on magnetic resonance (MR) imaging for the in vivo evaluation of the HHC translations due to an anteriorly directed force. Fourteen asymptomatic shoulders were acquired using a horizontal open MR scanner with the subjects in the supine position both at 15 degrees and 90 degrees of arm abduction with and without an anterior force of 20 N applied at the HHC level. When no load was applied, from 15 degrees to 90 degrees of arm abduction, the HHC moved, anteriorly (1.5 +/- 1.3 mm) and superiorly (1.8 +/- 1.3 mm) while smaller displacements were observed medio-laterally (0.4 +/- 0.7 mm). Under the application of the anterior force the 3D displacement of the HHC with respect to the glenoid was 1.6 +/- 1.2 mm and 1.3 +/- 0.7 mm, respectively at 15 degrees and 90 degrees of arm abduction. The level of precision associated to the GHJ translation was less than 0.33 mm along all directions i.e. one order of magnitude smaller than the relevant translations. In conclusion, the MRI-based methodology allowed for the analysis of HHC displacements under conditions of anterior loads within an acceptable level of reliability. (C) 2014 Elsevier Ltd. All rights reserved.
机译：Glenohumeral关节松弛的评价需要估计肱骨头中心（HHC）的位移相对于关节盂。对于作者的知识，已经进行了几项研究，以估计体内的HHC翻译，但尚未收集前装载条件下的数据。本研究的目的是基于磁共振（MR）成像的非侵入性实验方法，用于由于前一针向于前导力的HHC转换的体内评估。使用水平打开MR扫描仪获得14个无症状的肩部，其中仰卧位在仰卧位为15度和90度，在HHC水平上施加20n的前部力。当没有施加载荷时，从15度到90度的臂绑定，HHC移动，前（1.5 +/- 1.3 mm）和高级（1.8 +/- 1.3mm），同时观察到Medio横向较小的位移（0.4 + / - 0.7 mm）。在前部力的施加下，HHC相对于关节盂的3D位移分别为1.6 +/- 1.2mm，1.3 +/- 0.7mm，分别为15℃，90度的臂伸展。与GHJ平移相关的精度水平沿所有方向小于0.33mm。一级小于相关翻译。总之，基于MRI的方法允许在可接受的可靠性水平的前负荷条件下分析HHC位移。 （c）2014年elestvier有限公司保留所有权利。

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