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Because spinal coupling and loads on spinal tissues have been shown to be functions of the initial static posture, a rigorously derived neutral lumbar lordosis would be important for clinicians and spine researchers. This study presents modeling of the sagittal lumbar spine in the shape of an ellipse. Vertebral body and disc heights, derived from digitized lateral lumbar radiographs of 50 normal subjects, were used to create an ellipse along the posterior body margins from the inferior of T12 to the superior sacralbase. Additional data to create an elliptical lumbar model were determined from a least\u2010squares analysis of passing ellipses through the digitized posterior body points. This confirmed that an elliptical model closely fit the lumbar curvature with a least\u2010squares error of 1.2 mm per digitized point. The elliptical model is approximately an 85\u00b0 portion of a quadrant. The semi\u2010major and semi\u2010minor axes, a and b, are parallel to the posterior body margin of T12 and parallel to the inferior body endplate of T12, respectively, with a semi\u2010minor to semi\u2010major radio of b\/a = 0.39. The elliptic model has a height\u2010to\u2010' length ratio of H\/L = 0.963. where height is the vertical distance from inferior T12 to superior SI and length is the arc length along George's line (along the posterior longitudinal ligament) from T12 to SI.<\/jats:p>","DOI":"10.1002\/jor.1100160620","type":"journal-article","created":{"date-parts":[[2005,2,24]],"date-time":"2005-02-24T11:20:24Z","timestamp":1109244024000},"page":"766-770","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":86,"title":["Can the sagittal lumbar curvature be closely approximated by an ellipse?"],"prefix":"10.1002","volume":"16","author":[{"given":"Tadeusz J","family":"Janik","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donald D.","family":"Harrison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rene","family":"Cailliet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan J.","family":"Troyanovich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deed E.","family":"Harrison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,2,18]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-199602150-00006"},{"key":"e_1_2_1_3_2","unstructured":"Ashton\u2010MillerJA SkoglandLB:Musculoskeletal interactions in the adolescent spine: a study of the effect of somey geometric and material property changes in a three\u2010dimensional mathematical model. 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