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However, to date, an instantaneous centre has constituted no more than a convenient mathematical summary of vertebral kinematics. It has defied resolution into biologically meaningful parameters. This study offers a novel model of vertebral motion in which the instantaneous centre of rotation can be shown to be a function of the location of the centre of reaction of a vertebra, and the intrinsic rotation and translation it undergoes. These parameters are strictly linked by equations that determine the location of an axis of rotation. These equations allow aberrations in the location of an axis to be interpreted in terms of the anatomical and pathological factors that affect the centre of reaction of the vertebra and the rotation and translation it undergoes.<\/jats:p>","DOI":"10.1243\/pime_proc_1995_209_341_02","type":"journal-article","created":{"date-parts":[[2007,2,20]],"date-time":"2007-02-20T12:23:35Z","timestamp":1171974215000},"page":"177-183","source":"Crossref","is-referenced-by-count":57,"title":["A Biological Basis for Instantaneous Centres of Rotation of the Vertebral Column"],"prefix":"10.1177","volume":"209","author":[{"given":"N","family":"Bogduk","sequence":"first","affiliation":[{"name":"Faculty of Medicine and Health Sciences, University of Newcastle, New South Wales, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B","family":"Amevo","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Papua New Guinea, Port Moresby, Papua New Guinea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Pearcy","sequence":"additional","affiliation":[{"name":"School of Engineering, Flinders University of South Australia, Adelaide, South Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[1995,9,1]]},"reference":[{"key":"bibr1-PIME_PROC_1995_209_341_02","doi-asserted-by":"publisher","DOI":"10.1016\/0268-0033(91)90039-S"},{"key":"bibr2-PIME_PROC_1995_209_341_02","doi-asserted-by":"publisher","DOI":"10.1016\/0268-0033(91)90040-W"},{"key":"bibr3-PIME_PROC_1995_209_341_02","first-page":"281","volume":"191","author":"Pearcy M. 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