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Demographic information and physical exam measurements were obtained in addition to shear modulus measurements (passive muscle stiffness) of the lateral gastrocnemius muscle at 20\u00b0 plantar flexion, 10\u00b0 plantar flexion, and 0\u00b0 plantar flexion using <jats:styled-content style=\"fixed-case\">SWE<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Children with <jats:styled-content style=\"fixed-case\">CP<\/jats:styled-content> had significantly greater shear modulus measurements at all three foot positions (<jats:italic>p<\/jats:italic>&lt;0.050). When the shear modulus values were normalized to the baseline value for each child, there was no significant difference between the two groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Interpretation<\/jats:title><jats:p>Passive muscle stiffness, measured without the influence of spasticity, is greater in children with <jats:styled-content style=\"fixed-case\">CP<\/jats:styled-content> than in children with typical development when a muscle is at slack and at stretch. When shear modulus was normalized, the results indicate that muscle in children in both groups responds similarly to passive stretch. Further work includes evaluating effect of botulinum toxin on passive muscle properties.<\/jats:p><\/jats:sec>","DOI":"10.1111\/dmcn.13179","type":"journal-article","created":{"date-parts":[[2016,7,4]],"date-time":"2016-07-04T11:55:41Z","timestamp":1467633341000},"page":"1288-1294","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":105,"title":["Quantifying passive muscle stiffness in children with and without cerebral palsy using ultrasound shear wave elastography"],"prefix":"10.1111","volume":"58","author":[{"given":"Joline E","family":"Brandenburg","sequence":"first","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation Mayo Clinic College of Medicine Rochester MN USA"},{"name":"Department of Neurology Mayo Clinic College of Medicine Rochester MN USA"},{"name":"Department of Pediatric and Adolescent Medicine Mayo Clinic College of Medicine Rochester MN 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