Department of Musculoskeletal Radiology, Sahlgrenska University Hospital, Göteborgsvägen 31, 431 80, Gothenburg, Sweden.
Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Surg Radiol Anat. 2022 Nov;44(11):1439-1453. doi: 10.1007/s00276-022-03042-2. Epub 2022 Nov 8.
This study aimed to describe the internal structure of the infraspinatus muscle. A secondary aim was to explore differences in internal structure between genders, sides, and correlations to demographic data.
In total, 106 shoulder MRI examinations of patients between 18 and 30 years of age seeking care in 2012-2020 at The Sahlgrenska University Hospital in Gothenburg, Sweden were re-reviewed.
The number of intramuscular tendons centrally in the infraspinatus muscle varied between 3 and 8 (median = 5). Laterally, the number of intramuscular tendons varied between 1 and 5 (median = 2). There was no difference in the median between the genders or sides. No correlations between the number of intramuscular tendons and demographic data were found. The muscle volume varied between 63 and 249 ml with a median of 188 ml for males and 122 ml for females. There was no significant difference in volume between the sides. The muscle volume correlated with body weight (Pearson's correlation coefficient, r = 0.72, p < 0.001) and height (r = 0.61, p < 0.001).
The anatomical variations of the infraspinatus muscle are widespread. In the medial part of the muscle belly, the number of intramuscular tendons varied between 3 and 8, while the number of intramuscular tendons laterally varied between 1 and 5. Results of our study may help to understand the internal structure of the infraspinatus muscle and its function in shoulder stabilization.
本研究旨在描述冈下肌的内部结构。次要目的是探讨性别、侧别之间内部结构的差异以及与人口统计学数据的相关性。
对 2012 年至 2020 年期间在瑞典哥德堡市萨尔格伦斯卡大学医院就诊的 106 例 18-30 岁患者的肩部 MRI 检查进行重新回顾。
冈下肌中央肌内肌腱的数量在 3 至 8 条之间（中位数=5）。外侧肌内肌腱的数量在 1 至 5 条之间（中位数=2）。性别或侧别之间无中位数差异。未发现肌内肌腱数量与人口统计学数据之间存在相关性。肌肉体积在 63 至 249ml 之间，男性中位数为 188ml，女性中位数为 122ml。两侧之间的体积无显著差异。肌肉体积与体重（皮尔逊相关系数 r=0.72，p<0.001）和身高（r=0.61，p<0.001）相关。
冈下肌的解剖变异广泛存在。在肌腹的内侧部分，肌内肌腱的数量在 3 至 8 条之间，而肌内肌腱的数量在外侧在 1 至 5 条之间。本研究的结果可能有助于了解冈下肌的内部结构及其在肩部稳定中的功能。
