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MRIs were evaluated for successful reduction of the hip, volumes of femoral heads, and acetabular diameter. Initial treatment results were correlated to AC angles at two\u00a0years of follow-up. Contralateral, healthy hips served as control.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Out of 73 instable, dysplastic hips, there were nine cases of CR failure. These cases showed significantly increased femoral head volumes (<jats:italic>p<\/jats:italic>\u2009=\u20090.002) and a significantly (<jats:italic>p<\/jats:italic>\u2009=\u20090.02) larger ratio of femoral head volume to acetabular opening area. There was no significant difference (<jats:italic>p<\/jats:italic>\u2009=\u20090.15) in acetabular diameter between both groups. At two\u00a0years of follow-up, AC angles were significantly (<jats:italic>p<\/jats:italic>\u2009=\u20090.003) larger and pathologic in cases of CR failure.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Exclusive enlargement of the femoral head is a risk factor for unsuccessful reduction and its ratio to the acetabular opening surface is predictive for CR success in DDH.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00264-020-04655-1","type":"journal-article","created":{"date-parts":[[2020,6,2]],"date-time":"2020-06-02T17:05:01Z","timestamp":1591117501000},"page":"2343-2348","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Risk factors for failed closed reduction in dislocated developmental dysplastic hips"],"prefix":"10.1007","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6203-8616","authenticated-orcid":false,"given":"Sebastian Gottfried","family":"Walter","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph Hans-J\u00fcrgen","family":"Endler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anna Christina","family":"Remig","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julian A.","family":"Luetkens","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rahel","family":"Bornemann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Placzek","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,6,1]]},"reference":[{"key":"4655_CR1","doi-asserted-by":"publisher","first-page":"19","DOI":"10.1007\/BF02020214","volume":"23","author":"B Stover","year":"1993","unstructured":"Stover B, Bragelmann R, Walther A, Ball F (1993) Development of late congenital hip dysplasia: significance of ultrasound screening. 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