{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T22:23:45Z","timestamp":1769466225365,"version":"3.49.0"},"reference-count":33,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T00:00:00Z","timestamp":1769385600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T00:00:00Z","timestamp":1769385600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["25K18696"],"award-info":[{"award-number":["25K18696"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Anatomy"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>The specific anatomical features of the obturator internus, particularly those of its medial surface, remain insufficiently characterized. This study investigated the morphology of the obturator internus muscle by focusing on the shape of its medial surface and potential age\u2010related changes. Through dissection of anatomical specimens and in\u00a0vivo pelvic magnetic resonance imaging (MRI) analysis, we identified a consistent groove\u2010like structure on the medial surface of the muscle and divided it into distinct regions: a superior portion with radiating muscle fibers and an inferior portion with parallel\u2010aligned fibers. This division was characterized by differing fascicle orientations, with interspersed adipose tissue occasionally observed at the boundary. MRI scans of 27 women aged 25\u201383\u2009years demonstrated that this groove was consistently visible; its location and depth were quantified. The groove position showed a weak negative trend with age, but this relationship was not statistically significant and may have been underpowered. No significant correlation was found for groove depth. By delineating the consistent bipartite architecture of the obturator internus and identifying its age\u2010related variation, this study provides a detailed anatomical characterization of the medial surface of the obturator internus that may serve as a reference for future anatomical and clinical investigations involving the hip\u2013pelvic interface.<\/jats:p>","DOI":"10.1002\/ca.70082","type":"journal-article","created":{"date-parts":[[2026,1,26]],"date-time":"2026-01-26T11:54:27Z","timestamp":1769428467000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Grooved Surface of the Obturator Internus Muscle With Two Distinct Adjacent Parts"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4709-6359","authenticated-orcid":false,"given":"Satoru","family":"Muro","sequence":"first","affiliation":[{"name":"Department of Clinical Anatomy, Graduate School of Medical and Dental Sciences Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8392-2227","authenticated-orcid":false,"given":"Junichi","family":"Tsuchiya","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Radiology and Nuclear Medicine Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0518-1918","authenticated-orcid":false,"given":"Takuya","family":"Ibara","sequence":"additional","affiliation":[{"name":"Department of Functional Joint Anatomy, Biomedical Engineering Laboratory, Institute of Industry Incubation Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3054-0273","authenticated-orcid":false,"given":"Akimoto","family":"Nimura","sequence":"additional","affiliation":[{"name":"Department of Functional Joint Anatomy, Biomedical Engineering Laboratory, Institute of Industry Incubation Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2927-2937","authenticated-orcid":false,"given":"Keiichi","family":"Akita","sequence":"additional","affiliation":[{"name":"Department of Clinical Anatomy, Graduate School of Medical and Dental Sciences Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,1,26]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00276\u2010024\u201003384\u2010z"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1075"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.1186\/s13018\u2010021\u201002873\u2010w"},{"key":"e_1_2_12_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbiomech.2019.109436"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00192\u2010016\u20103167\u20105"},{"key":"e_1_2_12_7_1","first-page":"348","article-title":"Anatomische Notizen. Ein Musculus Obturator Internus Biceps","volume":"73","author":"Gruber W.","year":"1878","journal-title":"Archiv f\u00fcr Pathologische Anatomie"},{"key":"e_1_2_12_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/bco2.70001"},{"key":"e_1_2_12_9_1","volume-title":"Handbuch Der Muskellehre Des Menschen","author":"Henle J.","year":"1858"},{"key":"e_1_2_12_10_1","first-page":"505","article-title":"A Morphological Study of the Intrapelvic Portion of the Obturator Internus Muscle","volume":"73","author":"Honma S.","year":"1998","journal-title":"Acta Anatomica Nipponica"},{"key":"e_1_2_12_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12565\u2010023\u201000744\u20104"},{"key":"e_1_2_12_12_1","volume-title":"Clinically Oriented Anatomy","author":"Moore K. 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