Reliability of shoulder muscle stiffness measurement using strain ultrasound elastography and an acoustic coupler

Springer Science and Business Media LLC - Tập 48 - Trang 91-96 - 2020
Daisuke Shimoyama1, Hitoshi Shitara1, Noritaka Hamano1, Tsuyoshi Ichinose1, Tsuyoshi Sasaki1, Atsushi Yamamoto1, Tsutomu Kobayashi1, Tsuyoshi Tajika1, Kenji Takagishi1, Hirotaka Chikuda1
1Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, Maebashi, Japan

Tóm tắt

Abnormal increases in muscle tone can be caused by various musculoskeletal disorders. The objective of this study was to evaluate intratester and intertester reliabilities in measuring the stiffness of the shoulder muscles using strain ultrasound elastography (USE) and an acoustic coupler. Tissue stiffness was measured in the trapezius muscle and in the supraspinatus muscle of healthy young volunteers. The mean strain ratios measured by two experienced shoulder surgeons were significantly higher in the trapezius muscle than in the supraspinatus muscle (P < 0.001). Intratester reliability was rated as moderate to substantial for the trapezius muscle and substantial for the supraspinatus muscle. Intertester reliability was substantial for both muscles, with an intraclass correlation coefficient (2,1) of 0.62 [95% confidence interval (CI) 0.28–0.82] for the trapezius muscle and 0.69 (95% CI 0.40–0.86) for the supraspinatus muscle. We found substantial intratester and intertester reliabilities for the trapezius and supraspinatus muscles, suggesting that USE represents a promising modality for measuring the stiffness of shoulder muscles. However, the clinical application of this method will require the development of a device that can standardize the scanning technique to further increase the reliability.

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