Reliability of shoulder muscle stiffness measurement using strain ultrasound elastography and an acoustic coupler
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ORIGINAL ARTICLE–ORTHOPEDICS
Reliability of shoulder muscle stiffness measurement using strain ultrasound elastography and an acoustic coupler Daisuke Shimoyama1 · Hitoshi Shitara1 · Noritaka Hamano1 · Tsuyoshi Ichinose1 · Tsuyoshi Sasaki1 · Atsushi Yamamoto1 · Tsutomu Kobayashi1 · Tsuyoshi Tajika1 · Kenji Takagishi1 · Hirotaka Chikuda1 Received: 30 April 2020 / Accepted: 15 September 2020 © The Japan Society of Ultrasonics in Medicine 2020
Abstract Purpose 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. Method Tissue stiffness was measured in the trapezius muscle and in the supraspinatus muscle of healthy young volunteers. Results The mean strain ratios measured by two experienced shoulder surgeons were significantly higher in the trapezius muscle than in the supraspinatus muscle (P
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