{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T17:02:09Z","timestamp":1770224529134,"version":"3.49.0"},"reference-count":19,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2021,11,2]],"date-time":"2021-11-02T00:00:00Z","timestamp":1635811200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["PM&amp;R"],"published-print":{"date-parts":[[2022,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>The iliocapsularis muscle is a structure of the anterior hip, which may play a key role in stabilizing the hip joint, but to our knowledge no studies exist describing ultrasound (US) and shear\u2010wave characteristics of this muscle.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To investigate the anatomic dimensions and elasticity of the iliocapsularis muscle in patients with pincer\u2010type femoroacetabular impingement (FAI) and normal hips using gray\u2010scale US and shear\u2010wave elastography (SWE).<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>Case\u2010control study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>Sports medicine and ultrasound department within a tertiary hospital.<\/jats:p><\/jats:sec><jats:sec><jats:title>Participants<\/jats:title><jats:p>Thirty\u2010three patients (33 hips) with pincer\u2010type FAI and 37 healthy volunteers (37 hips).<\/jats:p><\/jats:sec><jats:sec><jats:title>Interventions<\/jats:title><jats:p>Not applicable.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main Outcome Measures<\/jats:title><jats:p>US parameters (anteroposterior diameter, transverse diameter and circumference) of the iliocapsularis muscle in patients with pincer\u2010type FAI and volunteers. Shear\u2010wave velocity and Young's modulus of the iliocapsularis muscle in patients with pincer\u2010type FAI and volunteers in both neutral and external rotation positions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Significant differences were not observed in the anatomic dimensions of the iliocapsularis muscle between patients with pincer\u2010type FAI and volunteers. The iliocapsularis muscle in patients with pincer\u2010type FAI had significantly lower shear\u2010wave velocity and Young's modulus than the volunteers (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05). The cutoff value of the maximum velocity in the external rotation position was 3.35\u2009m\/s, which separated pincer\u2010type FAI patients from volunteers and revealed the highest accuracy with sensitivity, specificity, and accuracy of 78.8%, 48.6%, and 64.3%, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The anatomic dimensions of the iliocapsularis muscle in pincer\u2010type FAI patients and volunteers were similar; however, iliocapsularis stiffness in patients with pincer\u2010type FAI was significantly lower than that of the volunteers. SWE can demonstrate altered muscle stiffness of the iliocapsularis muscle in pincer\u2010type FAI patients, which might be used to help make clinical decisions.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pmrj.12707","type":"journal-article","created":{"date-parts":[[2021,9,23]],"date-time":"2021-09-23T07:32:02Z","timestamp":1632382322000},"page":"1360-1367","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Ultrasound and shear\u2010wave elastography characteristics of the iliocapsularis muscle in pincer\u2010type femoroacetabular impingement"],"prefix":"10.1002","volume":"14","author":[{"given":"Cuiping","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Ultrasound Peking University Third Hospital  Beijing 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