Abstract

Objective

The purpose of this study was to determine whether SWE can detect biomechanical changes in the supraspinatus muscle that occur with increasing supraspinatus tendon abnormality prior to morphologic gray-scale changes.

Materials and methods

An IRB approved, HIPAA compliant retrospective study of shoulder ultrasounds from 2013–2018 was performed. The cohort consisted of 88 patients (mean age 55 ± 15 years old) with 110 ultrasounds. Images were acquired in longitudinal orientation to the supraspinatus muscle with shear wave velocity (SWV) point quantification. The tendon and muscle were graded in order of increasing tendinosis/tear (1–4 scale) and increasing fatty infiltration (0–3 scale). Mixed model analysis of variance, analysis of covariance, and Spearman rank correlation were used for statistical analysis.

Results

There was no statistically significant age or sex dependence for supraspinatus muscle SWV (p = 0.314, 0.118, respectively). There was no significant correlation between muscle SWV and muscle or tendon grade (p = 0.317, 0.691, respectively). In patients with morphologically normal muscle on gray-scale ultrasound, there were significant differences in muscle SWV when comparing tendon grade 3 with grades 1, 2, and 4 (p = 0.018, 0.025, 0.014, respectively), even when adjusting for gender and age (p = 0.044, 0.028, 0.018, respectively). Pairwise comparison of tendon grades other than those mentioned did not achieve statistical significance (p > 0.05).

Conclusion

SWE can detect biomechanical differences within the supraspinatus muscle that are not morphologically evident on gray-scale ultrasound. Specifically, supraspinatus tendon partial tears with moderate to severe tendinosis may correspond to biomechanically distinct muscle properties compared to both lower grades of tendon abnormality and full-thickness tears.

中文翻译：

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上颌肌剪切波弹性成像（SWE）：在灰度形态变化之前检测具有不同肌腱质量的生物力学差异

摘要

目的

这项研究的目的是确定SWE是否可以检测出形态上的灰度变化之前棘上肌腱异常增加而发生的棘上肌的生物力学变化。

材料和方法

进行了IRB批准的，符合HIPAA要求的2013-2018年肩部超声检查的回顾性研究。该队列包括88例患者（平均年龄55±15岁），接受110例超声检查。通过剪切波速度（SWV）点量化以纵向方式对棘上肌获取图像。肌腱和肌肉按腱/撕裂增加（1-4级）和脂肪浸润增加（0-3级）的顺序分级。方差，协方差和Spearman秩相关的混合模型分析用于统计分析。

结果

棘上肌SWV没有年龄或性别的统计学显着性（分别为p = 0.314、0.118）。肌肉SWV与肌肉或肌腱等级之间无显着相关性（分别为p = 0.317、0.691）。在使用灰度超声检查形态正常的肌肉患者中，即使将3级肌腱，1、2和4级肌腱进行比较，即使调整了性别和性别，肌SWV仍存在显着差异（分别为p = 0.018、0.025、0.014）。年龄（分别为p = 0.044、0.028、0.018）。成对比较除上述提到的以外的肌腱等级没有统计学意义（p> 0.05）。

结论

SWE可以检测出棘上肌内的生物力学差异，这在灰度超声上在形态学上并不明显。具体而言，与较低级别的肌腱异常和全层撕裂相比，具有中度到重度肌腱病的棘上肌腱部分撕裂可能对应于生物力学上独特的肌肉特性。