{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T08:20:05Z","timestamp":1791102005920,"version":"4.1.0"},"reference-count":23,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SPI"],"published-print":{"date-parts":[[2012,1]]},"abstract":"Object<\/jats:title>Sagittal spinopelvic imbalance is a major contributor to pain and disability for patients with adult spinal deformity (ASD). Preoperative planning is essential for pedicle subtraction osteotomy (PSO) candidates; however, current methods are often inaccurate because no formula to date predicts both postoperative sagittal balance and pelvic alignment. The authors of this study aimed to evaluate the accuracy of 2 novel formulas in predicting postoperative spinopelvic alignment after PSO.<\/jats:p><\/jats:sec>Methods<\/jats:title>This study is a multicenter retrospective consecutive PSO case series. Adults with spinal deformity (> 21 years old) who were treated with a single-level lumbar PSO for sagittal imbalance were evaluated. All patients underwent preoperative and a minimum of 6-month postoperative radiography. Two novel formulas were used to predict the postoperative spinopelvic alignment. The results predicted by the formulas were then compared with the actual postoperative radiographic values, and the formulas' ability to identify successful (sagittal vertical axis [SVA] \u2264 50 mm and pelvic tilt [PT] \u2264 25\u00b0) and unsuccessful (SVA > 50 mm or PT > 25\u00b0) outcomes was evaluated.<\/jats:p><\/jats:sec>Results<\/jats:title>Ninety-nine patients met inclusion criteria. The median absolute error between the predicted and actual PT was 4.1\u00b0 (interquartile range 2.0\u00b0\u20136.4\u00b0). The median absolute error between the predicted and actual SVA was 27 mm (interquartile range 11\u201347 mm). Forty-one of 54 patients with a formula that predicted a successful outcome had a successful outcome as shown by radiography (positive predictive value = 0.76). Forty-four of 45 patients with a formula that predicted an unsuccessful outcome had an unsuccessful outcome as shown by radiography (negative predictive value = 0.98).<\/jats:p><\/jats:sec>Conclusions<\/jats:title>The spinopelvic alignment formulas were accurate when predicting unsuccessful outcomes but less reliable when predicting successful outcomes. The preoperative surgical plan should be altered if an unsuccessful result is predicted. However, even after obtaining a predicted successful outcome, surgeons should ensure that the predicted values are not too close to unsuccessful values and should identify other variables that may affect alignment. In the near future, it is anticipated that the use of these formulas will lead to better surgical planning and improved outcomes for patients with complex ASD.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2011.8.spine11272","type":"journal-article","created":{"date-parts":[[2011,9,23]],"date-time":"2011-09-23T13:33:11Z","timestamp":1316784791000},"page":"15-21","source":"Crossref","is-referenced-by-count":73,"title":["Multicenter validation of a formula predicting postoperative spinopelvic alignment"],"prefix":"10.3171","volume":"16","author":[{"given":"Virginie","family":"Lafage","sequence":"first","affiliation":[{"name":"1Department of Orthopedic Surgery, New York University Langone Medical Center\u2013Hospital for Joint Diseases;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neil J.","family":"Bharucha","sequence":"additional","affiliation":[{"name":"1Department of Orthopedic Surgery, New York University Langone Medical Center\u2013Hospital for Joint Diseases;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank","family":"Schwab","sequence":"additional","affiliation":[{"name":"1Department of Orthopedic Surgery, New York University Langone Medical Center\u2013Hospital for Joint Diseases;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert A.","family":"Hart","sequence":"additional","affiliation":[{"name":"2Department of Orthopedic Surgery, Oregon Health & Science University, Portland, Oregon;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Douglas","family":"Burton","sequence":"additional","affiliation":[{"name":"3Department of Orthopedic Surgery, University of Kansas Medical Center, Kansas City, Kansas;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oheneba","family":"Boachie-Adjei","sequence":"additional","affiliation":[{"name":"4Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Justin S.","family":"Smith","sequence":"additional","affiliation":[{"name":"5Department of Neurological Surgery, University of Virginia Health System, Charlottesville, Virginia;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard","family":"Hostin","sequence":"additional","affiliation":[{"name":"6Orthopedic and Spine Surgery, Southwest Scoliosis Institute, Plano, Texas;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"Shaffrey","sequence":"additional","affiliation":[{"name":"5Department of Neurological Surgery, University of Virginia Health System, Charlottesville, Virginia;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Munish","family":"Gupta","sequence":"additional","affiliation":[{"name":"7Department of Orthopedic Surgery, University of California Davis Medical Center, Sacramento;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Behrooz A.","family":"Akbarnia","sequence":"additional","affiliation":[{"name":"8Orthopedic Surgery, San Diego Center for Spinal Disorders, La Jolla, California; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shay","family":"Bess","sequence":"additional","affiliation":[{"name":"9Orthopedic Center, Rocky Mountain Hospital for Children, Denver, Colorado"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1-spine11272","doi-asserted-by":"crossref","first-page":"2164","DOI":"10.1097\/01.BRS.0000084666.53553.D6","volume":"28","author":"Berven S","year":"2003","journal-title":"Spine (Phila Pa 1976)"},{"key":"b2-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-199908150-00013"},{"key":"b3-spine11272","doi-asserted-by":"publisher","DOI":"10.1007\/s00586-005-0984-5"},{"key":"b4-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e31814b2d52"},{"key":"b5-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000167534.49069.e9"},{"key":"b6-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-199710150-00025"},{"key":"b7-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-199203000-00025"},{"key":"b8-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000155425.04536.f7"},{"key":"b9-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000179086.30449.96"},{"key":"b10-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000238970.67552.f5"},{"key":"b11-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e3181aad219"},{"key":"b12-spine11272","doi-asserted-by":"publisher","DOI":"10.3171\/2010.9.SPINE10129"},{"key":"b13-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e3181eb9469"},{"key":"b14-spine11272","doi-asserted-by":"publisher","DOI":"10.1007\/s005860050008"},{"key":"b15-spine11272","first-page":"213","volume":"71","author":"Legaye J","year":"2005","journal-title":"Acta Orthop Belg"},{"key":"b16-spine11272","doi-asserted-by":"publisher","DOI":"10.1007\/s005860050038"},{"key":"b17-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e3181a9c7ad"},{"key":"b18-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000247950.02886.e5"},{"key":"b19-spine11272","first-page":"218","volume":"89","author":"Rillardon L","year":"2003","journal-title":"Rev Chir Orthop Repar Appar Mot"},{"key":"b20-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000152379.54463.65"},{"key":"b21-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/01.brs.0000231725.38943.ab"},{"key":"b22-spine11272","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0b013e3181a13c08"},{"key":"b23-spine11272","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1097\/00003086-198504000-00019","volume":"194","author":"Thomasen E","year":"1985","journal-title":"Clin Orthop Relat Res"}],"container-title":["Journal of Neurosurgery: Spine"],"original-title":[],"link":[{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/16\/1\/article-p15.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-spine\/16\/1\/article-p15.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,12,6]],"date-time":"2021-12-06T08:57:53Z","timestamp":1638781073000},"score":1,"resource":{"primary":{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/16\/1\/article-p15.xml"}},"subtitle":["Clinical article"],"short-title":[],"issued":{"date-parts":[[2012,1]]},"references-count":23,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.3171\/2011.8.spine11272","relation":{},"ISSN":["1547-5654"],"issn-type":[{"value":"1547-5654","type":"print"}],"subject":[],"published":{"date-parts":[[2012,1]]}}}