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Quantified patellar tendon stiffness after injury may help guide clinical care. Continuous shear wave elastography (cSWE) allows for the assessment of viscosity and shear modulus in tendons. The reliability of the measure, however, has not been established in the patellar tendon. The purpose of this study was to investigate the interrater reliability, intrarater reliability, and between\u2010day stability of cSWE in both healthy and pathological patellar tendons.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Participants with patellar tendinopathy (n\u00a0=\u00a013), history of ACLR using bone\u2010patellar tendon\u2010bone autograft (n\u00a0=\u00a09), and with no history of patellar tendon injury (n\u00a0=\u00a013) were recruited. cSWE was performed 4 times by multiple raters over 2\u2009days. Intraclass correlations (ICC) and minimum detectable change (MDC<jats:sub>95%<\/jats:sub>) were calculated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Good to excellent between\u2010day stability were found for viscosity (ICC\u00a0=\u00a00.905, MDC<jats:sub>95%<\/jats:sub>\u00a0=\u00a08.3\u00a0Pa\u2009seconds) and shear modulus (ICC\u00a0=\u00a00.805, MDC<jats:sub>95%<\/jats:sub>\u00a0=\u00a027.4\u00a0kPa). The interrater reliability measures, however, were not as reliable (ICC\u00a0=\u00a00.591 and 0.532).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>cSWE is a reliable assessment tool for quantifying patellar tendon viscoelastic properties over time. It is recommended, however, that a single rater performs the measure as the interrater reliability was less than ideal.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jum.16115","type":"journal-article","created":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T15:57:35Z","timestamp":1666886255000},"page":"1047-1055","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Reliability of Continuous Shear Wave Elastography in the Pathological Patellar Tendon"],"prefix":"10.1002","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4166-5319","authenticated-orcid":false,"given":"Naoaki","family":"Ito","sequence":"first","affiliation":[{"name":"Biomechanics and Movement Science Program University of Delaware  Newark Delaware USA"},{"name":"Department of Physical Therapy University of Delaware  Newark Delaware USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haraldur 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