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European Spine Journal

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01-11-2016 | Original Article

Normative values for the L5 incidence in a subgroup of transitional anomalies extracted from 147 asymptomatic subjects

Authors: D. Dominguez, A. Faundez, H. Demezon, A. Cogniet, J. C. Le Huec

Published in: European Spine Journal | Issue 11/2016

Abstract

Purpose

Pelvic incidence angle is not always measurable due to lumbosacral transitional vertebrae (LSV). The fifth lumbar vertebra (L5) is rarely abnormal. The purpose of this study was to quantify from full-body standing X-rays, the L5 incidence angle (L5I) in a normal asymptomatic population and to correlate it with standard spino-pelvic parameters taking the sacrum (S1) as a reference.

Methods

One hundred and forty seven asymptomatic volunteers were enrolled. The ethics committee approved the study protocol. Subjects underwent a low-dose full spine X-ray. 3D reconstructions were obtained and L5I was measured using the upper L5 endplate as the reference instead of the S1 endplate. A group of subjects with LSV was identified and subdivided in two subgroups. Standard spino-pelvic parameters and normative values for the L5 parameters were obtained. Statistical correlations were calculated between the standard and L5 parameters as well as L5I with L1–L5 lordosis in both subgroups.

Results

Twenty two (14.96 %) subjects with LSV were found. Ten of these had an unidentifiable S1 endplate due to a sacralisation of L5. Mean values for the L5I, L5 tilt, L5 slope and L1–L5 lordosis were, respectively, 22.43, 4.65, 17.73, and 45.51 for normal subjects (N = 137) and 32.75, 6.63, 26.38, and 55.02 for sacralisation of L5 subjects (N = 10). Mathematical relationship found: L5I = 0.7641 * PI − 17.725 (R = 0.83) and L1–L5 = 0.67 * L5I + 30.7 (R = 0.64).

Conclusion

This prospective study is first to provide normative spino-pelvic values at the L5 level in an asymptomatic population, particularly in case of (LSV) sacralisation of L5 (N = 10) where L5I and L1–L5 lordosis appears to be 10° more important than in normal population. We propose L5I as a new spino-pelvic parameter to restore in case of L5-S1 disk disease. These normative values will help to control peri-operatively the adequate lordosis restoration, in the presence of LSV.

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Title: Normative values for the L5 incidence in a subgroup of transitional anomalies extracted from 147 asymptomatic subjects
Authors: D. Dominguez
A. Faundez
H. Demezon
A. Cogniet
J. C. Le Huec
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: European Spine Journal / Issue 11/2016
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-015-4371-6

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Normative values for the L5 incidence in a subgroup of transitional anomalies extracted from 147 asymptomatic subjects

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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