Flexion-extension rhythm of lumbosacral spine

Guan Liang Chang, Fong-chin Su, Kuen Horng Tsai, Ruey Mo Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Eighty-nine normal subjects were examined with lateral functional radiographs of standing, flexion and extension position using Putto' method. A specially designed radiopaque ruler was put on each film for calibration. Computer-assisted method was used for digitization and analysis. The mean values (standard deviation) of flexion-extension rotation in L1-L2, L2-L3, L3-L4, L4-L5 and L5-S1 were 6.9 (3.1), 13.9 (4.1), 12.6 (4.4), 14.4 (4.0), and 11.8 (6.0) degrees, respectively. The mean values (standard deviations) of flexion-extension translation in L1-2, L2-3, L3-4, L4-5 and L5-S1 were 1.3 (0.09), 1.5 (1.4), 2.2 (1.2), 2.0 (1.3) and 0.4 (0.17) respectively. From flexion to extension, the segmental rotation approached to zero degree and the intersegmental translation changed from retrolisthetic to neutral position although the changes were small. For the flexion-extension rotation, although the large variations may limit some clinical usefulness in the judgement of instability, the data still provided good diagnostic basis if the frequency was taken into consideration. For example, for translation changes, 2 mm was regarded as acceptable in most cases at the levels from L1 to L5 and in the level of L5-S1, the average translation change was only 0.4 mm.

Original languageEnglish
Title of host publicationProceedings of the Annual Conference on Engineering in Medicine and Biology
EditorsAndrew Y.J. Szeto, Rangaraj M. Rangayyan
PublisherPubl by IEEE
Pages1131-1132
Number of pages2
Editionpt 3
ISBN (Print)0780313771
Publication statusPublished - 1993 Dec 1
EventProceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 3 (of 3) - San Diego, CA, USA
Duration: 1993 Oct 281993 Oct 31

Publication series

NameProceedings of the Annual Conference on Engineering in Medicine and Biology
Numberpt 3
Volume15
ISSN (Print)0589-1019

Other

OtherProceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 3 (of 3)
CitySan Diego, CA, USA
Period93-10-2893-10-31

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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