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Six asymptomatic volunteers were imaged (0.5\u00a0T upright MRI) in 4 postures: standing, standing pelvic retroversion, standing 30\u00b0 flexion, and supine. Measures included muscle morphometry [cross-sectional area (CSA), circularity, radius, and angle] of the gluteus and iliopsoas, and pelvic geometry [pelvic tilt (PT), pelvic incidence (PI), sacral slope (SS), L3\u2013S1 lumbar lordosis (LL)] L3-coccyx. With\u00a0four volunteers repeating postures, and three raters assessing repeatability, there was generally good repeatability [ICC(3,1) 0.80\u20130.97]. Retroversion had level dependent effects on muscle measures, for example gluteus CSA and circularity increased (up to 22%).\u00a0Retroversion increased PT, decreased SS, and decreased L3\u2013S1 LL, but did not affect PI. Gluteus CSA and circularity also had level-specific correlations with PT, SS, and L3\u2013S1 LL. Overall, upright MRI of the lumbopelvic musculature is feasible with good reproducibility, and the morphometry of the involved muscles significantly changes with posture. This finding has the potential to be used for clinical consideration in designing and performing future studies with greater number of healthy subjects and patients.<\/jats:p>","DOI":"10.1038\/s41598-021-99305-w","type":"journal-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T10:18:43Z","timestamp":1633947523000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Synchronous imaging of pelvic geometry and muscle morphometry: a pilot study of pelvic retroversion using upright MRI"],"prefix":"10.1038","volume":"11","author":[{"given":"Noor","family":"Shaikh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Honglin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen H. 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