A cineradiographic study on the lumbar disc deformation during flexion and extension of the trunk
To reveal deformation behaviour of normal lumbar discs ( L 3 4 , L 4 5 and L 5 S 1 , the lumbar spines of eight asymptomatic volunteers were examined cineradiographically during flexion and extension of the trunk. Disc deformation could be evaluated by displacement of the superior corners of the dis...
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Published in | Clinical biomechanics (Bristol) Vol. 10; no. 4; pp. 193 - 199 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
England
Elsevier Ltd
01.06.1995
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Subjects | |
Online Access | Get full text |
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Summary: | To reveal deformation behaviour of normal lumbar discs (
L
3
4
,
L
4
5
and
L
5
S
1
, the lumbar spines of eight asymptomatic volunteers were examined cineradiographically during flexion and extension of the trunk. Disc deformation could be evaluated by displacement of the superior corners of the disc, which were measured with respect to the upper surface of the adjacent lower vertebra. Furthermore the
in-vivo strain distribution of each lumbar disc was analysed by the finite element method and
in-vivo measurement of the disc deformation. During flexion, deformation of the lumbar disc increased rapidly after a certain delay from the start of trunk motion and reached maximum value before the finish of trunk motion. It was also confirmed that time lags were present between the onsets of disc deformation. Namely, each disc deformed not simultaneously but stepwise from the upper to the lower level with time lags during flexion. When the lower disc deformation started, the strain at the adjacent upper discs had already reached more than half of the value at full flexion. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0268-0033 1879-1271 |
DOI: | 10.1016/0268-0033(95)91397-W |