Supraspinatus muscle shear wave elastography (SWE): detection of biomechanical differences with varying tendon quality p
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SCIENTIFIC ARTICLE
Supraspinatus muscle shear wave elastography (SWE): detection of biomechanical differences with varying tendon quality prior to gray-scale morphologic changes Dana J. Lin 1
&
Christopher J. Burke 1 & Benjamin Abiri 1 & James S. Babb 1 & Ronald S. Adler 1
Received: 30 May 2019 / Revised: 22 October 2019 / Accepted: 23 October 2019 # ISS 2019
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 SWVand 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. Keywords Supraspinatus . Muscle . Shear . Wave . Elastography
Abbreviations US Ultrasound MRI Magnetic resonance imaging SWE Shear wave elastography SWV Shear wave velocity ARFI Acoustic radiation force impulse ROI Region of interest
* Ronald S. Adler [email protected] 1
Department of Radiology, Division of Musculoskeletal Radiology, NYU Langone Health, 301 East 17th Street, 6th Floor, New York, NY 10003, USA
Introduction It is well-established that rotator cuff muscle fatty infiltration correlates with poor functional outcomes after rotator cuff repair [1–3]. Semiquantitative evaluation of fatty infiltration using Goutallier grading is already for most musculoskeletal radiologists a requisite part of the preoperative interpretation. While this is typically evaluated on magnetic resonance imaging (MRI), prio
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