{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T14:05:16Z","timestamp":1790345116104,"version":"4.1.0"},"reference-count":40,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T00:00:00Z","timestamp":1772150400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T00:00:00Z","timestamp":1772150400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2026,3]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Adult spinal deformity patients undergoing total hip arthroplasty experience higher hip dislocation rates than those with normal spinal alignment. The traditional Lewinnek safe zone does not account for spinopelvic variation such as pelvic retroversion. To address this, three patient\u2010specific normative zones for acetabular anteversion were defined. A multicenter retrospective analysis of 146 adult spinal deformity patients and 47 asymptomatic controls was performed using three\u2010dimensional biplanar radiograph reconstructions to measure spinopelvic alignment and acetabular orientation. Normative Zone 1, for patients not undergoing spinal realignment, was delineated by the 95% confidence interval limits: minimum anteversion\u2009=\u20090.3182 \u00d7 pelvic tilt +2.947 and maximum anteversion\u2009=\u20090.3317 \u00d7 pelvic tilt +25.823. Normative Zone 2, for patients following spinal realignment, was based on pelvic incidence: minimum anteversion\u2009=\u20090.0682 \u00d7 pelvic incidence +9.7749 and maximum anteversion\u2009=\u20090.0698 \u00d7 pelvic incidence +21.5218. Normative Zone 3, intended for cases with uncertain spinal correction plans, was defined as the intersection of Zones 1 and 2, yielding a narrower target anteversion range. These zones enable patient\u2010specific cup placement that accounts for existing or planned spinal alignment, with the potential to reduce dislocation risk.<\/jats:p>\n                  <jats:p>\n                    <jats:bold>Clinical Significance:<\/jats:bold>\n                    This study provides acetabular cup orientation tailored to each patient's spinopelvic alignment and surgical plan, potentially reducing dislocation rates in spinal malalignment patients.\n                  <\/jats:p>","DOI":"10.1002\/jor.70171","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T16:02:59Z","timestamp":1772985779000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A New Normative Zone for Acetabular Anteversion Positioning in ASD Patients"],"prefix":"10.1002","volume":"44","author":[{"given":"Marc","family":"Boutros","sequence":"first","affiliation":[{"name":"Faculty of Medicine, Saint 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G.","family":"Lenke","sequence":"additional","affiliation":[{"name":"Columbia University, New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierce D.","family":"Nunley","sequence":"additional","affiliation":[{"name":"Specialists Hospital \u2010 Shreveport Shreveport Louisiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter G.","family":"Passias","sequence":"additional","affiliation":[{"name":"New York University, Langone Medical Center, New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank J.","family":"Schwab","sequence":"additional","affiliation":[{"name":"Lenox Hill Hospital Department of Orthopaedic Surgery Northwell Health, New York New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher I.","family":"Shaffrey","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery Duke University Medical Center Durham North Carolina 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