The effect of posture on lumbar muscle morphometry from upright MRI.
Noor ShaikhHonglin ZhangStephen H M BrownJason R ShewchukZakariya VawdaHanbing ZhouJohn StreetDavid R WilsonThomas R OxlandPublished in: European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2020)
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.