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dc.contributor.authorMeakin, Judith R.
dc.contributor.authorGregory, Jennifer S.
dc.contributor.authorSmith, Francis W.
dc.contributor.authorGilbert, Fiona J.
dc.contributor.authorAspden, Richard M.
dc.date.accessioned2013-08-09T14:46:25Z
dc.date.issued2008
dc.description.abstractStudy Design. Analysis of positional magnetic resonance images of normal volunteers. Objective. To compare the reliability and precision of an active shape model to that of conventional lordosis measurements. Summary of Background Data. Characterization of lumbar lordosis commonly relies on measurement of angles; these have been found to have errors of around 10[degrees]. Methods. T2 weighted sagittal images of the lumbar spines of 24 male volunteers in the standing posture were acquired using a positional magnetic resonance scanner. An active shape model of the vertebral bodies from S1 to L1 was created. Lumbar lordosis was also determined by measuring the angles of the superior endplates. All measurements were performed twice by one observer and once by a second observer. Results. The shape model identified 2 modes of variation to describe the shape of the lumbar spine (mode 1 described curvature and mode 2 described evenness of curvature). Significant correlations were found between mode 1 and total lordosis (R = 0.97, P < 0.001) and between mode 2 and mean absolute deviation of segmental lordosis (R = 0.80, P < 0.001). Intra- and interobserver reliability was higher for the shape model (intraclass correlation coefficients, 0.98-1.00) than for the lordosis angle measurements (intraclass correlation coefficients, 0.68-0.99). The relative error of the shape model (mode 1 = 4%; mode 2 = 9%) was lower than the conventional measurements (total lordosis = 10%). Conclusion. The shape of the lumbar spine in the sagittal plane can be comprehensively characterized using a shape model. The results are more reliable and precise than measurements of lordosis calculated from endplate angles.en_GB
dc.identifier.citationVol. 33 (7), pp. 807 - 813en_GB
dc.identifier.doi10.1097/BRS.0b013e31816949e6
dc.identifier.urihttp://hdl.handle.net/10871/12381
dc.language.isoenen_GB
dc.publisherLippincott, Williams & Wilkinsen_GB
dc.relation.urlhttp://www.ncbi.nlm.nih.gov/pubmed/18379410en_GB
dc.relation.urlhttp://dx.doi.org/10.1097/BRS.0b013e31816949e6en_GB
dc.subjectAdulten_GB
dc.subjectAnalysis of Varianceen_GB
dc.subjectHumansen_GB
dc.subjectImage Processing, Computer-Assisteden_GB
dc.subjectLordosisen_GB
dc.subjectLumbar Vertebraeen_GB
dc.subjectMagnetic Resonance Imagingen_GB
dc.subjectMaleen_GB
dc.subjectMiddle Ageden_GB
dc.subjectPostureen_GB
dc.subjectReference Valuesen_GB
dc.subjectReproducibility of Resultsen_GB
dc.subjectSoftwareen_GB
dc.titleCharacterizing the shape of the lumbar spine using an active shape model: reliability and precision of the methoden_GB
dc.typeArticleen_GB
dc.date.available2013-08-09T14:46:25Z
dc.identifier.issn0362-2436
pubs.declined2016-04-12T14:00:52.232+0100
pubs.deleted2016-04-12T14:00:52.558+0100
exeter.place-of-publicationUnited States
dc.descriptionCopyright © 2008 Lippincott, Williams & Wilkinsen_GB
dc.descriptionThis is a non-final version of an article published in final form in Spine Vol. 33 (7), pp. 807-813 (2008)en_GB
dc.identifier.eissn1528-1159
dc.identifier.journalSpineen_GB


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