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Volume and fat infiltration of spino-pelvic musculature in adults with spinal deformity

World Journal of Orthopedics 2015年第9期6卷 727-737页

作者： Bertrand Moal Nicolas Bronsard José G Raya Jean Marc Vital Frank Schwab Wafa Skalli Virginie Lafage Spine Division Hospital for Joint DiseasesNew-York University University Langone Medical Center Nice University Hospital Center Orthopedic and Traumatologic Surgery DepartmentH?pital Saint Roch Center for Biomedical Imaging Department of RadiologyNew York University Langone Medical Center University Hospital of Bordeaux Spinal UnitDepartement of Orthopaedic Surgery Laboratory of Biomechanics Arts et Métiers ParisTech

AIM: To investigate fat infiltration and volume of spino-pelvic muscles in adults spinal deformity(ASD) with magnetic resonance imaging(MRI) and 3D ***: Nineteen female ASD patients(mean age 60 ± 13) were included prospectively and consecutively and had T1-weighted Turbo Spin Echo sequence MRIs with Dixon method from the proximal tibia up to T12 vertebra. The Dixon method permitted to evaluate the proportion of fat inside each muscle(fat-water ratio). In order to investigate the accuracy of the Dixon method for estimating fat vs water, the same MRI acquisition was performed on phantoms of four vials composed of different proportion of fat vs water. With Muscl'X software, 3D reconstructions of 17 muscles or group of muscles were obtained identifying the muscle's contour on a limited number of axial images [Deformation of parametric specific objects(DPSO) Method]. Musclar volume(Vmuscle), infiltrated fat volume(Vfat) and percentage of fat infiltration [Pfat, calculated as follow: Pfat = 100 ×(Vfat/Vmuscle)] were characterized by extensor or flexor function respectively for the spine, hip and knee and theirs relationship with demographic data were investigated. RESULTS: Phantom acquisition demonstrated a non linear relation between Dixon fat-water ratio and the real fat-water ratio. In order to correct the Dixon fatwater ratio, the non linear relation was approximated with a polynomial function of degree three using the phantom acquisition. On average, Pfat was 13.3% ± 5.3%. Muscles from the spinal extensor group had a Pfat significantly greater than the other muscles groups, and the largest variability(Pfat = 31.9% ± 13.8%, P < 0.001). Muscles from the hip extensor group ranked 2nd in terms of Pfat(14% ± 8%), and were significantly greater than those of the knee extensor(P = 0.030). Muscles from the knee extensor group demonstrated the least Pfat(12% ± 8%). They were also the only group with a significant correlation between Vmuscle and Pfat(r =-0.

关键词： Spino-pelvic musculature Adults with spinal deformity Muscular degeneration Muscular volume Fat infiltration Dixon method

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