Shear Wave Elastography can evaluate Annulus Fibrosus Alteration in Adolescent Scoliosis
Résumé
Objectives
In vitro studies showed that annulus fibrosus lose its integrity in idiopathic
scoliosis. Shear wave ultrasound elastography can be used for noninvasive
measurement of shear wave speed (SWS) in vivo in the annulus fibrosus, a
parameter related to its mechanical properties. The main aim was to assess SWS
in lumbar annulus fibrosus of scoliotic adolescents and compare it to healthy
subjects.
Methods
SWS was measured in 180 lumbar IVDs (L3L4, L4L5, L5S1) of thirty healthy
adolescents (13 yo ± 1.9) and thirty adolescent idiopathic scoliosis patients (13 yo
± 2, Cobb angle: 28.8° ± 10.4°). SWS was compared between scoliosis and
healthy control group.
Results
In healthy subjects, average SWS (all disc levels pooled) was 3.0 ± 0.3 m/s
whereas, in scoliotic patients it was significantly higher at 3.5 ± 0.3 m/s (p =
0.0004; Mann-Whitney test). Differences were also significant at all disc levels.
No difference was observed between males and females. No correlation was
found with age, weight and height.
Conclusion
Non-invasive shear wave ultrasound is a novel method of assessment to
quantitative alteration of annulus fibrosus. These preliminary results are
promising to consider shear wave elastography as a biomechanical marker for
assessment of idiopathic scoliotic.
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