Department of Sport Medicine, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China.
Department of Ultrasound, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China.
Orthop Surg. 2021 Jul;13(5):1570-1578. doi: 10.1111/os.12989. Epub 2021 Jun 9.
To investigate the Young's modulus value of infraspinatus tendons using shear wave elastography (SWE) technique in normal adults, and to analyze the influence of gender, postures, exercise, and dominant side on Young's modulus of infraspinatus tendons.
This is a prospective cross-sectional study. From January 2019 to July 2020, 14 healthy subjects were identified, including seven males and seven females aged between 24 to 34, with a mean age of 27.67 ± 3.08 years. The Young's modulus of their infraspinatus tendons was measured by two operators using SWE in neutral and maximum external rotation positions of both sides before exercise and the dominant side after exercise. The Young's modulus values in different sexes, different postures, before vs after exercise, and dominant vs non-dominant side were statistically analyzed.
All 14 subjects completed the data collection process. The mean Young's modulus values of infraspinatus tendon for dominant sides in neutral position were 33.04 ± 3.01 kPa for males and 28.76 ± 3.09 kPa for females. And for non-dominant sides in the neutral position, the values were 33.02 ± 2.38 kPa for males and 28.86 ± 2.47 kPa for females. In the maximum external rotation position, the values for dominant sides were 50.19 ± 4.86 kPa for males and 42.79 ± 4.44 kPa for females, and for non-dominant sides were 50.95 ± 3.24 kPa for males and 42.42 ± 3.66 kPa for females. After exercise, the mean Young's modulus values of infraspinatus tendon for dominant sides in neutral position were 54.56 ± 3.76 kPa for males and 46.66 ± 5.99 kPa for females. And for the maximum external rotation position, the values were 59.13 ± 3.78 kPa for males and 54.49 ± 5.67 kPa for females. The Young's modulus of infraspinatus tendon in the neutral and maximum external rotation positions showed statistically significant differences in males and females, as well as before and after exercise (P < 0.05). However, the difference in Young's modulus between the dominant and non-dominant sides was not statistically significant (P > 0.05). Intergroup reliability between both operators was excellent (ICC > 0.85).
There are gender-related differences and post-exercise increase in Young's modulus, yet such a difference cannot be witnessed between the dominant and non-dominant sides.
使用剪切波弹性成像（SWE）技术研究正常成年人冈下肌腱的杨氏模量值，并分析性别、体位、运动和优势侧对冈下肌腱杨氏模量的影响。
这是一项前瞻性的横断面研究。2019 年 1 月至 2020 年 7 月，共纳入 14 名健康受试者，包括 7 名男性和 7 名女性，年龄 24 至 34 岁，平均年龄 27.67±3.08 岁。在运动前和运动后的优势侧，由两名操作者使用 SWE 分别测量双侧冈下肌腱在中立位和最大外旋位时的杨氏模量。统计分析不同性别、不同体位、运动前后、优势侧与非优势侧的杨氏模量值。
所有 14 名受试者均完成了数据采集过程。男性优势侧冈下肌腱在中立位时的平均杨氏模量值为 33.04±3.01kPa，女性为 28.76±3.09kPa。而在中立位的非优势侧，男性的平均值为 33.02±2.38kPa，女性为 28.86±2.47kPa。在最大外旋位时，男性优势侧的平均值为 50.19±4.86kPa，女性为 42.79±4.44kPa，非优势侧的平均值为 50.95±3.24kPa，女性为 42.42±3.66kPa。运动后，男性优势侧冈下肌腱在中立位时的平均杨氏模量值为 54.56±3.76kPa，女性为 46.66±5.99kPa。在最大外旋位时，男性为 59.13±3.78kPa，女性为 54.49±5.67kPa。男性和女性、运动前后冈下肌腱的杨氏模量在中立位和最大外旋位均有统计学差异（P<0.05）。然而，优势侧和非优势侧的杨氏模量差异无统计学意义（P>0.05）。两名操作者之间的组内信度均为优秀（ICC>0.85）。
冈下肌腱的杨氏模量存在性别相关差异和运动后增加，但在优势侧和非优势侧之间并未观察到这种差异。
