Measurement comparison about lumbar lordosis: Radiography and 3D motion capture

S. H. Hwang, S. W. Park, Y. H. Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Lumbar lordosis is defined as the anterior convexity of the lumbar spine in the sagittal plane. Its degree is variable between individuals, affected many other factors. Clinical methods to define lumbar lordosis are Cobb's angle measurement and the angle between extension line of boundary of the first and fifth vertebral body. In this study, the lordotic angle calculated by reflective markers when the three dimensional motion capture system was used compared to the angle calculated from radiography. The coordinates of vertebral body center from radiographic images were digitized. The vertebral body center coordinates from radiographic image and the coordinates from markers were used to calculate lumbar lordotic angle with three different method(ratio method, three point method and curve-fit method). The lordotic angles from radiographic image(θf) were larger than the angles from markers(θ m) in all three methods. The ratio method using radiographic image and the curve-fit method using markers showed the largest coefficient of variance(θf - θm)and the coefficient of variances in all three methods using radiographic image were smaller than using markers. However, the analysis according to Bland-Altiman plot showed a good agreement between both methods(radiography and motion analysis).

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering
Subtitle of host publicationImage Processing, Biosignal Processing, Modelling and Simulation, Biomechanics
PublisherSpringer Verlag
Pages1669-1671
Number of pages3
Edition4
ISBN (Print)9783642038815
DOIs
StatePublished - 2009
Externally publishedYes
EventWorld Congress on Medical Physics and Biomedical Engineering: Image Processing, Biosignal Processing, Modelling and Simulation, Biomechanics - Munich, Germany
Duration: Sep 7 2009Sep 12 2009

Publication series

NameIFMBE Proceedings
Number4
Volume25
ISSN (Print)1680-0737

Conference

ConferenceWorld Congress on Medical Physics and Biomedical Engineering: Image Processing, Biosignal Processing, Modelling and Simulation, Biomechanics
Country/TerritoryGermany
CityMunich
Period09/7/0909/12/09

Keywords

  • Lumbar lordosis
  • Motion analysis system
  • Radiography
  • Reflective marker

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