{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T11:16:38Z","timestamp":1780571798846,"version":"3.54.1"},"reference-count":30,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2016,10,28]],"date-time":"2016-10-28T00:00:00Z","timestamp":1477612800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Anatomy"],"published-print":{"date-parts":[[2017,1]]},"abstract":"<jats:p>Muscle strain of the gastrocnemius medial head mainly occurs at the musculotendinous junction (MTJ), and stiffness is a risk factor. Shear wave elastography (SWE) measures elasticity by determining the propagation velocity. The aim of this study was to measure the elasticity of the normal muscle and aponeurosis in the MTJ of the gastrocnemius medial head using SWE, thus obtaining information relevant to muscle strain at this point. Forty\u2010one volunteers (82 legs) were recruited and the gastrocnemius medial heads were examined at four points: three on the aponeurosis, namely at the center of the MTJ (<jats:italic>Central<\/jats:italic>), 10 mm proximal to it (<jats:italic>Proximal<\/jats:italic>) and 10 mm distal to it (<jats:italic>Distal<\/jats:italic>); and at one on the muscle belly (<jats:italic>Muscle<\/jats:italic>). The measurements were compared among the points, between males and females, and between younger and middle\u2010aged subjects. Correlations between the elastic modulus and age were also examined. The elastic moduli at <jats:italic>Proximal<\/jats:italic>, <jats:italic>Central<\/jats:italic>, <jats:italic>Distal<\/jats:italic>, and <jats:italic>Muscle<\/jats:italic> were 2.82\u2009\u00b1\u20090.53 m\/s, 3.43\u2009\u00b1\u20090.83 m\/s, 4.83\u2009\u00b1\u20091.56 m\/s, and 2.25\u2009\u00b1\u20090.43 m\/s, respectively. These values differed significantly among the points of the aponeurosis, <jats:italic>Distal<\/jats:italic> having the highest modulus followed by <jats:italic>Central<\/jats:italic>. The elastic moduli were significantly greater in males than females at <jats:italic>Distal<\/jats:italic> and <jats:italic>Muscle<\/jats:italic> and in younger subjects than middle\u2010aged subjects at <jats:italic>Muscle<\/jats:italic>. No significant correlations between elastic modulus and age were observed for any point. SWE could be a feasible method for quantifying the elasticity of muscle and aponeurosis in the MTJ of the gastrocnemius medial head.  Clin. 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