{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T07:01:48Z","timestamp":1790146908639,"version":"4.0.1"},"reference-count":17,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100008334","name":"Stiftung Oskar-Helene-Heim","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100008334","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Radiol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Isthmic spondylolisthesis is prevalent among adolescent athletes (AA). Upright MRI (uMRI) offers a radiation-free alternative to radiographs, combining imaging of the loaded spine with detailed depiction of the adjacent structures. This study evaluates the feasibility and intra-rater measurement repeatability of spinopelvic and lumbar parameter assessment in AA using uMRI and radiography, as well as cross-modality agreement between both imaging techniques.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Material and methods<\/jats:title>\n                    <jats:p>Lumbar sagittal T2-weighted low-field uMRI and lateral standing radiographs from 38 AA with isthmic spondylolisthesis were retrospectively reviewed. Cases of both imaging techniques without motion artifacts, performed within one year, presenting the lumbar spine and spinopelvic junction were included. Spinopelvic and lumbar parameters [e.g., anterior translation (AT)] were determined. Relative reliability was measured by intraclass correlation coefficient (ICC). Absolute reliability measures included standard error of measurement (SEM), test-retest variability (TRV), minimal detectable change (MDC), and Bland-Altman analysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Images from 16 AA (13.5\u2009\u00b1\u20091.8years; 159\u2009\u00b1\u20097\u2005cm; 50\u2009\u00b1\u20099\u2005kg) fulfilled the inclusion criteria. Data exclusion mainly occurred due to time discrepancy (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20099) and poor image quality (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20098). Relative reliability ranged from 0.89 to 0.95 for radiographs, 0.61 to 0.94 for uMRI and from 0.61 to 0.88 between the methods. Absolute reliability showed lower variability for radiographs (SEM: 3\u20138%; TRV: 5\u201314%, AT-MDC: 1.4\u2005mm) compared to uMRI (SEM: 2\u201329%; TRV: 9\u201349%; AT-MDC: 2.0\u2005mm) and between methods (SEM: 4\u201334%; TRV: 11\u201346%; AT-MDC: 3.2\u2005mm).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion and conclusion<\/jats:title>\n                    <jats:p>On evaluable images, uMRI demonstrated moderate-to-excellent intra-rater measurement repeatability for several parameters. However, cross-modality agreement with radiography was variable and does not support interchangeability between the two modalities. uMRI may therefore represent a complementary radiation-free imaging modality for selected patients and parameters, pending prospective validation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fradi.2026.1929174","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:19:51Z","timestamp":1790144391000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Exploratory evaluation of spinopelvic and lumbar parameters in adolescent athletes with isthmic spondylolisthesis: feasibility and reliability of upright MRI compared to radiography"],"prefix":"10.3389","volume":"6","author":[{"given":"Michael","family":"Cassel","sequence":"first","affiliation":[{"name":"University of Potsdam \u2013 Outpatient Clinic","place":["Potsdam, Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theresa","family":"Joost","sequence":"additional","affiliation":[{"name":"University of Potsdam \u2013 Outpatient Clinic","place":["Potsdam, Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chase","family":"Slater","sequence":"additional","affiliation":[{"name":"University of Potsdam \u2013 Outpatient Clinic","place":["Potsdam, Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank","family":"Mayer","sequence":"additional","affiliation":[{"name":"University of Potsdam \u2013 Outpatient Clinic","place":["Potsdam, Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tilman","family":"Engel","sequence":"additional","affiliation":[{"name":"University of Potsdam \u2013 Outpatient Clinic","place":["Potsdam, Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1204","DOI":"10.3122\/jabfm.2022.220130R1","article-title":"Spondylolysis and isthmic spondylolisthesis: a guide to diagnosis and management","volume":"35","author":"Mohile","year":"2022","journal-title":"J Am Board Fam Med"},{"key":"B2","doi-asserted-by":"publisher","first-page":"100802","DOI":"10.1016\/j.semss.2020.100802","article-title":"Classifications in spondylolisthesis","volume":"32","author":"Gallagher","year":"2020","journal-title":"Semin Spine Surg"},{"key":"B3","doi-asserted-by":"publisher","first-page":"2484","DOI":"10.1097\/01.brs.0000239155.37261.69","article-title":"Sagittal alignment of the spine and pelvis in the presence of L5-S1 isthmic lysis and low-grade spondylolisthesis","volume":"31","author":"Roussouly","year":"2006","journal-title":"Spine"},{"key":"B4","doi-asserted-by":"publisher","first-page":"29","DOI":"10.1097\/JSA.0b013e318163be50","article-title":"Spondylolysis and spondylolisthesis in the athlete","volume":"16","author":"Tallarico","year":"2016","journal-title":"Sport Med Orthop Resid"},{"key":"B5","doi-asserted-by":"publisher","first-page":"621","DOI":"10.1055\/s-0039-1697937","article-title":"Weight-bearing MRI of the lumbar spine\u202f: spinal stenosis and spondylolisthesis","volume":"1","author":"Hansen","year":"2019","journal-title":"Semin Musculoskelet Radiol"},{"key":"B6","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1155\/2020\/9235958","article-title":"Spondylolysis in young athletes: an overview emphasizing nonoperative management","volume":"2020","author":"Goetzinger","year":"2020","journal-title":"J Sports Med"},{"key":"B7","doi-asserted-by":"publisher","first-page":"299","DOI":"10.1016\/j.nec.2019.02.003","article-title":"Degenerative lumbar spondylolisthesis: definition, natural history, conservative management, and surgical treatment","volume":"30","author":"Bydon","year":"2019","journal-title":"Neurosurg Clin N Am"},{"key":"B8","doi-asserted-by":"publisher","first-page":"1255","DOI":"10.1016\/j.spinee.2015.02.016","article-title":"Changes in lumbar spondylolisthesis on axial-loaded MRI: do they reproduce the positional changes in the degree of olisthesis observed on x-ray images in the standing position?","volume":"15","author":"Kanno","year":"2015","journal-title":"Spine J"},{"key":"B9","first-page":"247","article-title":"Importance of correlating static and dynamic imaging studies in diagnosing degenerative lumbar spondylolisthesis","volume":"30","author":"Bendo","year":"2001","journal-title":"Am J Orthop"},{"key":"B10","doi-asserted-by":"publisher","first-page":"220","DOI":"10.1016\/j.orthtr.2015.05.002","article-title":"Belastungsabh\u00e4ngige segmentstabilit\u00e4t im funktions-MRT bei nachwuchsathleten mit spondylolisthesis mit und ohne r\u00fcckenschmerzen","volume":"31","author":"Cassel","year":"2015","journal-title":"Sport Orthop Traumatol"},{"key":"B11","doi-asserted-by":"publisher","first-page":"67","DOI":"10.5960\/dzsm.2023.564","article-title":"Reliability of segmental instability and spinopelvic alignment in athletes with isthmic spondylolisthesis in functional MRI","volume":"74","author":"Joost","year":"2023","journal-title":"Dtsch Z Sportmed"},{"key":"B12","doi-asserted-by":"publisher","first-page":"155","DOI":"10.1016\/j.jcm.2016.02.012","article-title":"A guideline of selecting and reporting intraclass correlation coefficients for reliability research","volume":"15","author":"Koo","year":"2016","journal-title":"J Chiropr Med"},{"key":"B13","doi-asserted-by":"publisher","first-page":"217","DOI":"10.2165\/00007256-199826040-00002","article-title":"Statistical methods for assessing measurement error (reliability) in variables relevant to sports medicine","volume":"26","author":"Atkinson","year":"1998","journal-title":"Sport Med"},{"key":"B14","doi-asserted-by":"publisher","first-page":"438","DOI":"10.1093\/ons\/opz180","article-title":"Assessing the differences in measurement of degree of spondylolisthesis between supine MRI and erect x-ray: an institutional analysis of 255 cases","volume":"18","author":"Alvi","year":"2020","journal-title":"Oper Neurosurg"},{"key":"B15","doi-asserted-by":"publisher","first-page":"1885310","DOI":"10.1080\/23746149.2021.1885310","article-title":"Physical and technical aspects of human magnetic resonance imaging: present status and 50 years historical review","volume":"6","author":"Kose","year":"2021","journal-title":"Adv Phys X"},{"key":"B16","doi-asserted-by":"publisher","first-page":"298","DOI":"10.4103\/jnrp.jnrp_508_17","article-title":"Comparison of four radiographic angular measures of lumbar lordosis","volume":"9","author":"Okpala","year":"2018","journal-title":"J Neurosci Rural Pract"},{"key":"B17","volume-title":"Appropriate Magnetic Resonance Imaging Ordering","author":"Ashby","year":"2024"}],"container-title":["Frontiers in Radiology"],"original-title":[],"link":[{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fradi.2026.1929174\/full","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:19:52Z","timestamp":1790144392000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fradi.2026.1929174\/full"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,23]]},"references-count":17,"alternative-id":["10.3389\/fradi.2026.1929174"],"URL":"https:\/\/doi.org\/10.3389\/fradi.2026.1929174","relation":{},"ISSN":["2673-8740"],"issn-type":[{"value":"2673-8740","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,23]]},"article-number":"1929174"}}