MRI measurement of position, orientation and shape of long biceps tendon in healthy volunteers

doi:10.3969/j.issn.2095-4344.2014.24.014

Abstract

Abstract:

BACKGROUND: In previous studies, the eccentricity of long biceps tendon at the entrance to the groove has not been measured, but merely described qualitatively.
OBJECTIVE: To characterize the position, orientation and shape of the long biceps tendon on MR images acquired in neutral position, external rotation, and internal rotation of the shoulder in asymptomatic volunteers, to explore MRI characteristics of the long biceps tendon for clinical assessment.
METHODS: A total of 35 asymptomatic volunteers were included. MR scanning images were acquired in neutral position, external rotation and internal rotation of the shoulder. All MR images were evaluated by two radiologists, exclusive criteria were volunteers with lesions or any kind of degenerative changes to the rotator cuff tendons, coracohumeral ligament, superior glenohumeral ligament, and/or pulley fibers. The 3D WATSc sequence of long biceps tendon was measured at superior, middle, and inferior levels of the bicipital groove by a radiologist. The position, orientation, and shape of long biceps tendon were measured.
RESULTS AND CONCLUSION: The results of MR images in neutral position, external rotation and internal rotation of the shoulder were followed: (1) The long biceps tendon eccentricity was maximal in the neutral position. (2) The orientations of long biceps tendon were acute angle, and the differences in long biceps tendon orientation were significant at middle and inferior measurement levels. (3) At inferior measurement level, the changes of shape of long biceps tendon showed significant differences. The findings showed that the position, orientation and shape of the long biceps tendon were slightly dependent on shoulder rotation and measurement level.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

全文链接：

Key words: humeral head, tendinopathy, shoulder joint, magnetic resonance imaging, ligaments, articular

CLC Number:

R318

Zhao Heng, Liu Jin-cai, Chen Li-xun, Zhou Hong, Hu Rong, Qing Wei-peng, Quan Xiao-bing. MRI measurement of position, orientation and shape of long biceps tendon in healthy volunteers[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(24): 3850-3854.

Figures/Tables 1

2.1 位置在上测量层面、中测量层面、下测量层面上，中立位与外旋位、中立位与内旋位肱二头肌长头肌腱前后、内外方向相对位置之间的差异大部分有显著性意义(P < 0.05)，除下测量层面的前后相对位置中立位与外旋位之间的差异没有显著性意义(P > 0.05)。结果见表2。肩关节中立位，上测量层面肱二头肌长头肌腱前后方向相对位置的平均值为1.4 mm，中测量层面肱二头肌长头肌腱前后方向相对位置的平均值为-1.4 mm，下测量层面肱二头肌长头肌腱前后方向相对位置的平均值为-1.9 mm。肩关节中立位，上测量层面肱二头肌长头肌腱内外方向相对位置的平均值为1.9 mm，中测量层面肱二头肌长头肌腱内外方向相对位置的平均值为1.8 mm，下测量层面肱二头肌长头肌腱内外方向相对位置的平均值为1.4 mm。中立位肱二头肌长头肌腱在内外方向的偏离度最大，而外旋位和内旋位在内外方向的偏离度小。 2.2 方向在中测量层面、下测量层面上，中立位与外旋位、中立位与内旋位之间肱二头肌长头肌腱方向的差异具有显著性意义(P < 0.05)，上测量层面的中立位与外旋位、中立位与内旋位之间肱二头肌长头肌腱方向的差异没有显著性意义(P > 0.05)。详细结果见表2。肩关节中立位，上测量层面肱二头肌长头肌腱方向的平均值为45°，中测量层面肱二头肌长头肌腱方向的平均值为53°，下测量层面肱二头肌长头肌腱方向的平均值为39°。在中、下测量层面上，外旋位的肱二头肌长头肌腱方向角度最小，内旋位的肱二头肌长头肌腱方向角度最大，中立位的肱二头肌长头肌腱方向角度位于外旋位、内旋位之间。 2.3 形态 3个肩关节体位中，在上测量层面志愿者肱二头肌长头肌腱主要是扁平形、逗点形。在中测量层面，肱二头肌长头肌腱主要是扁平形、逗点形，肩关节外旋位其次是椭圆形，内旋位其次是椭圆形。在下测量层面，外旋位、中立位肱二头肌长头肌腱主要是椭圆形、扁平形，中立位其次是逗点形，内旋位肱二头肌长头肌腱的主要是圆形或椭圆形，其次是扁平形。肱二头肌长头肌腱形态分级结果，见表3。在上测量层面、中测量层面上，中立位分别与外旋位、内旋位之间的形态差异无显著性意义(P > 0.05)。而在下测量层面上，中立位分别与外旋位、内旋位之间的形态差异均有显著性意义(P=0.017、< 0.001)。在下测量层面上，肱二头肌长头肌腱的形态受到体位的影响。从中立位向外旋位变化，肱二头肌长头肌腱形态具有从主要椭圆形、扁平形，其次逗点形，向主要椭圆形、扁平形变化的趋势；从中立位向内旋位变化，肱二头肌长头肌腱形态具有从主要椭圆形、扁平形，其次逗点形，向主要圆形或椭圆形，其次扁平形变化的趋势。"

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