The effect of posture on lumbar muscle morphometry from upright MRI.
Eur Spine J
; 29(9): 2306-2318, 2020 09.
Article
in En
| MEDLINE
| ID: mdl-32335742
ABSTRACT
PURPOSE:
To assess the effect of upright, seated, and supine postures on lumbar muscle morphometry at multiple spinal levels and for multiple muscles.METHODS:
Six asymptomatic volunteers were imaged (0.5 T upright open MRI) in 7 postures (standing, standing holding 8 kg, standing 45° flexion, seated 45° flexion, seated upright, seated 45° extension, and supine), with scans at L3/L4, L4/L5, and L5/S1. Muscle cross-sectional area (CSA) and muscle position with respect to the vertebral body centroid (radius and angle) were measured for the multifidus/erector spinae combined and psoas major muscles.RESULTS:
Posture significantly affected the multifidus/erector spinae CSA with decreasing CSA from straight postures (standing and supine) to seated and flexed postures (up to 19%). Psoas major CSA significantly varied with vertebral level with opposite trends due to posture at L3/L4 (increasing CSA, up to 36%) and L5/S1 (decreasing CSA, up to 40%) with sitting/flexion. For both muscle groups, radius and angle followed similar trends with decreasing radius (up to 5%) and increasing angle (up to 12%) with seated/flexed postures. CSA and lumbar lordosis had some correlation (multifidus/erector spinae L4/L5 and L5/S1, r = 0.37-0.45; PS L3/L4 left, r = - 0.51). There was generally good repeatability (average ICC(3, 1) posture = 0.81, intra = 0.89, inter = 0.82).CONCLUSION:
Changes in multifidus/erector spinae muscle CSA likely represent muscles stretching between upright and seated/flexed postures. For the psoas major, the differential level effect suggests that changing three-dimensional muscle morphometry with flexion is not uniform along the muscle length. The muscle and spinal level-dependent effects of posture and spinal curvature correlation, including muscle CSA and position, highlight considering measured muscle morphometry from different postures in spine models.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Posture
/
Lumbosacral Region
Limits:
Humans
Language:
En
Journal:
Eur Spine J
Journal subject:
ORTOPEDIA
Year:
2020
Document type:
Article
Affiliation country:
Canadá