{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T14:47:30Z","timestamp":1787755650639,"version":"build-2784847793"},"reference-count":19,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"12","license":[{"start":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T00:00:00Z","timestamp":1648771200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,6,15]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Classic and reverse Bernese periacetabular osteotomy (PAO) have been shown to be effective for the treatment of developmental dysplasia of the hip (by classic PAO), severe acetabular retroversion (by reverse PAO), and some protrusio acetabuli (by reverse PAO). Especially in severe cases with higher degrees of correction, a relevant overlap between the osteotomized fragment and the pelvis might occur, leading to necessary fragment translation. The aim of the present study was to analyze the necessary translation as a function of the degree of correction using a statistical mean model of the pelvis according to the technique (classic PAO or reverse PAO).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>A mean statistical shape model of the pelvis and 2 extreme models were used to simulate rotation of the osteotomized fragment during a classic or reverse PAO and to calculate rotations from \u221220\u00b0 to 20\u00b0 in the frontal, sagittal, and transverse planes and a combination thereof. The depth and volume of the intersection between the mobilized fragment and the pelvis were calculated, and the minimum translation of the fragment necessary to avoid segment overlap was determined.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>The maximum intersection distances between the pelvis and the 20\u00b0 rotated fragment were 6.7 and 15.3 mm for adduction and abduction (frontal plane), 6.4 and 4.5 mm for internal and external rotation (transverse plane), and 27.8 and 9.2 mm for extension and flexion (sagittal plane). The necessary translations for 20\u00b0 of fragment rotation were 7.0 and 12.8 mm for adduction and abduction (frontal plane), 4.8 and 5.0 mm for internal and external rotation (transverse plane), and 18.5 mm and 8.8 mm for extension and flexion (sagittal plane).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>Acetabular reorientation with the classic or reverse PAO results in translation of the fragment and in a consequent change in the rotational center. This finding is more pronounced with higher degrees of fragment reorientation in abduction and extension; it becomes especially pronounced in reverse PAO for acetabular retroversion or protrusio acetabuli, and might limit the ability to achieve the intended improvement in overall hip biomechanics.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2106\/jbjs.21.00454","type":"journal-article","created":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T14:09:35Z","timestamp":1648822175000},"page":"1107-1115","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":2,"title":["A Statistical Shape Model-Based Analysis of Periacetabular Osteotomies"],"prefix":"10.2106","volume":"104","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6010-8847","authenticated-orcid":false,"given":"Philipp","family":"Kriechling","sequence":"first","affiliation":[{"name":"Department of Orthopaedics, Balgrist University Hospital, Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Leoty","sequence":"additional","affiliation":[{"name":"Research in Orthopaedic Computer Science (ROCS), Balgrist University Hospital, University of Zurich, Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6484-6206","authenticated-orcid":false,"given":"Philipp","family":"F\u00fcrnstahl","sequence":"additional","affiliation":[{"name":"Research in Orthopaedic Computer Science (ROCS), Balgrist University Hospital, University of Zurich, Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0976-6849","authenticated-orcid":false,"given":"Dana","family":"Rahbani","sequence":"additional","affiliation":[{"name":"Graphics and Vision Research Group (GraVis), University of Basel, Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick O.","family":"Zingg","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Balgrist University Hospital, Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8526-6032","authenticated-orcid":false,"given":"Lazaros","family":"Vlachopoulos","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Balgrist University Hospital, Zurich, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","published-online":{"date-parts":[[2022,4,1]]},"reference":[{"issue":"3","key":"bib1-20250430","doi-asserted-by":"crossref","first-page":"91","DOI":"10.5435\/JAAOS-D-18-00533","article-title":"Developmental Dysplasia of the Hip in Adolescents and Young Adults","volume":"28","author":"Schmitz","year":"2020","journal-title":"J Am Acad Orthop Surg."},{"issue":"3","key":"bib2-20250430","doi-asserted-by":"crossref","first-page":"218","DOI":"10.2106\/JBJS.17.00337","article-title":"Intermediate-Term Hip Survivorship and Patient-Reported Outcomes of Periacetabular Osteotomy: The Washington University Experience","volume":"100","author":"Wells","year":"2018","journal-title":"J Bone Joint Surg Am."},{"issue":"4","key":"bib3-20250430","doi-asserted-by":"crossref","first-page":"1154","DOI":"10.1007\/s11999-016-5169-5","article-title":"One-third of Hips After Periacetabular Osteotomy Survive 30 Years With Good Clinical Results, No Progression of Arthritis, or Conversion to THA","volume":"475","author":"Lerch","year":"2017","journal-title":"Clin Orthop Relat Res."},{"issue":"2","key":"bib4-20250430","doi-asserted-by":"crossref","first-page":"278","DOI":"10.2106\/00004623-200302000-00015","article-title":"Anterior femoro-acetabular impingement due to acetabular retroversion. 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