Day-to-day variability of median nerve location within the carpal tunnel
Day-to-day variability of median nerve location within the carpal tunnel
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DOI：
10.1016/j.clinbiomech.2010.04.009
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发表时间：
2010-08-01
影响因子：
1.8
通讯作者：
Brown, Thomas D.
中科院分区：
文献类型：
--
作者：
Goetz, Jessica E.;Thedens, Daniel R.;Brown, Thomas D.
背景：腕管综合征是一种常见的由正中神经机械损伤引起的卡压性疾病。磁共振成像（MRI）为基础的调查记录了典型的正中神经内的腕管的位置，但是，目前还不清楚这些位置是否是一致的在一个人在不同的days.Methods：为了确定神经位置的日常变化，3.0 T MRI扫描，从6个正常志愿者在多个会议上获得三个不同的日子。一半的扫描是在手腕处于中性屈曲和手指伸展的情况下采集的，另一半是在手腕处于35 °屈曲和手指屈曲的情况下采集的。在一半的扫描（两种姿势）之前，受试者进行预处理程序，包括指定的手部活动和多次重复的腕关节屈曲/伸展。正中神经和三个选定的屈肌腱的形状，方向，位置和位置半径的变化，确定为每个主题和days.Findings之间进行比较：两个的六个主题有很大的变异神经位置时，手腕是在中立的，和四个主题有很高的变异神经位置时，手腕弯曲。神经变异性通常大于肌腱变异性。预处理常规没有减少神经或肌腱的位置变异性，无论是在中立或弯曲的腕positions.Interpretation：高流动性和潜在的大变异性正中神经的位置在腕管需要铭记在心时，解释MR图像的神经位置。(C)2010爱思唯尔有限公司版权所有。
Background: Carpal tunnel syndrome is a commonly encountered entrapment disorder resulting from mechanical insult to the median nerve. Magnetic resonance imaging (MRI)-based investigations have documented typical locations of the median nerve within the carpal tunnel; however, it is unclear whether those locations are consistent within an individual on different days.Methods: To determine the day-to-day variability of nerve location, 3.0 T MRI scans were acquired from six normal volunteers over multiple sessions on three different days. Half of the scans were acquired with the wrist in neutral flexion and the fingers extended, and the other half were acquired with the wrist in 35 of flexion and the fingers flexed. Prior to half of the scans (in both poses), subjects performed a preconditioning routine consisting of specified hand activities and several repetitions of wrist flexion/extension. The shape, orientation, location, and location radius of variability of the median nerve and three selected flexor tendons were determined for each subject and compared between days.Findings: Two of the six subjects had substantial variability in nerve location when the wrist was in neutral, and four of the subjects had high variability in nerve position when the wrist was flexed. Nerve variability was typically larger than tendon variability. The preconditioning routine did not decrease nerve or tendon location variability in either the neutral or the flexed wrist positions.Interpretation: The high mobility and potential for large variability in median nerve location within the carpal tunnel needs to be borne in mind when interpreting MR images of nerve location. (C) 2010 Elsevier Ltd. All rights reserved.