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Analysis of apex and transitional vertebra of the spine according to pelvic incidence using orientation and position parameters

Article dans une revue avec comité de lecture
Author
ROSCOP, Cécile
300122 CHU Bordeaux [Bordeaux]
MATHIO, Paul
300122 CHU Bordeaux [Bordeaux]
GAJNY, Laurent
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
KOUYOUMDJIAN, Pascal
361498 Centre Hospitalier Universitaire de Nîmes [CHU Nîmes]
SKALLI, Wafa
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
GILLE, Olivier
300122 CHU Bordeaux [Bordeaux]

URI
http://hdl.handle.net/10985/21561
DOI
10.1007/s00586-021-06908-y
Date
2021
Journal
European Spine Journal

Abstract

Objective: To identify the different apex and transitional vertebra according to the shape of the pelvis of individuals despite their difference in sagittal alignment using our measurement system. Methods: Full spine X-rays using EOS in standard stand-position of 99 volunteers were selected (47 women, 52 men, mean age 31years old). Validated 3D reconstruction technique allowing extraction of spinopelvic parameters, and position and rotation of each vertebra and lumbar discs. Subjects were divided in three groups: low PI (low PI, n=37), moderate PI (mid PI, n=52), high PI (high PI, n=10), with respectively a PI below 45 °, between 45 °-60 ° and above 60 °. Occurrence of specific position and rotation values of apex and transitional vertebra were assessed in each groups. Results: Frequency curves tend to move cranially when the incidence increases except in cervicothoracic where T1 is a constant for all shape of spine with occurrence approaching 90%. Angulation value of relevant vertebra and lumbar lordosis are significantly positively correlated for the whole population. Conclusions: Our study allowed the assessment of the distribution of spine curvatures according to the pelvic incidence. It describes the occurrence of localization of the apex and transitional vertebrae according to pelvic incidence. These results should be taken into account during the analysis of the sagittal balance, especially when planning deformity surgery in adults.

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