Prospective Evaluation of Normal Supraspinatus Muscle Using Shear Wave Elastography

Author:

Jeong Jeung Yeol1,Khil Eun Kyung23ORCID,Seo Woorim2

Affiliation:

1. Department of Orthopedic Surgery Hallym University Dongtan Sacred Heart Hospital Hwaseong‐si Republic of Korea

2. Department of Radiology Hallym University Dongtan Sacred Heart Hospital Hwaseong‐si Republic of Korea

3. Department of Radiology Fastbone Orthopedic Hospital Hwaseong‐si Republic of Korea

Abstract

ObjectiveThis study aimed to evaluate normal supraspinatus (SS) muscle elasticity using shear wave elastography (SWE) in an asymptomatic group, analyze its correlation with demographic factors and ultrasound (US) grayscale grade, and compare the elasticity between normal SS muscles and symptomatic SS muscles with tendon tears.MethodsA prospective study was conducted with 101 adult patients with normal SS muscle scheduled for surgery due to a contralateral shoulder with SS tendon tear. Both shoulders underwent US examinations, including SWE. The SWE values, including mean and median elasticity, as well as the elasticity ratio, were analyzed for their correlation with demographic characteristics and grayscale grades. A comparison of SWE values was performed between the normal and symptomatic SS muscle groups.ResultsThe mean SWE modulus of the normal SS muscle was 27.87 kPa (±49.04), with an elasticity ratio of approximately 1.52 (±0.03). Males exhibited slightly higher elasticity ratios compared with females (1.61 vs 1.45, P = .016). The interobserver agreement for all SWE measurements was excellent (>0.8). Grayscale grade increased with age, showing a similar pattern in females (P < .001). However, no significant correlation was observed between SWE values and grayscale grade in the normal SS muscle group. SWE values in normal SS muscles were significantly lower than those with tendon tears (P < .001).ConclusionsSWE provides objective measurements of normal SS muscle elasticity. Gender‐based variations were observed, with males exhibiting slightly higher elastography ratios. SWE values were significantly lower in asymptomatic SS muscles compared with those with tendon tears.

Publisher

Wiley

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