The effect of posture on lumbar muscle morphometry from upright MRI

European spine journal

article

Noor Shaikh¹  Honglin Zhang⁴  Stephen H. M. Brown⁵  Jason R. Shewchuk⁶  Zakariya Vawda⁶  Hanbing Zhou²  John Street²  David R. Wilson²  Thomas R. Oxland² 

[1] School of Biomedical Engineering, University of British Columbia;Blusson Spinal Cord Centre, University of British Columbia;Department of Mechanical Engineering, University of British Columbia;Centre for Hip Health and Mobility, University of British Columbia;Department of Human Health and Nutritional Sciences, University of Guelph;Department of Radiology, Vancouver General Hospital;Department of Orthopaedics, University of British Columbia

关键词: Upright MRI;    Lumbar muscle;    Spinal muscle;    Muscle morphometry;    Posture;    Biomechanics;    MRI;    Spine;    Weight-bearing;    Mechanics;   

DOI  :  10.1007/s00586-020-06409-4

来源: Springer

【 摘 要 】

To assess the effect of upright, seated, and supine postures on lumbar muscle morphometry at multiple spinal levels and for multiple muscles. 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. 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). 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.

【 授权许可】

Unknown