Quantitative Dixon MRI sequences to relate muscle atrophy and fatty degeneration with range of motion and muscle force in brachial plexus injury |
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| Institution: | 1. Department of Orthopaedics, Leiden University Medical Center, The Netherlands;2. Department of Radiology, Leiden University Medical Center, The Netherlands;3. Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, The Netherlands;4. Mathematica institute Leiden University, Leiden University Medical Center, The Netherlands;5. C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, The Netherlands;1. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology of Chinese Academy of Sciences, China;2. Shenzhen Key Laboratory for MRI, Shenzhen, China;3. Department of Radiology and Biomedical Imaging, University of California San Francisco, CA, USA;4. UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, USA;1. Paul C. Lauterbur Research Centre for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, China;2. Shenzhen Key Laboratory for MRI, Shenzhen, Guangdong, China;2. Department of Neurology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil |
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| Abstract: | BackgroundAssessment of muscle atrophy and fatty degeneration in brachial plexus injury (BPI) could yield valuable insight into pathophysiology and could be used to predict clinical outcome. The objective of this study was to quantify and relate fat percentage and cross-sectional area (CSA) of the biceps to range of motion and muscle force of traumatic brachial plexus injury (BPI) patients.MethodsT1-weighted TSE sequence and three-point Dixon images of the affected and non-affected biceps brachii were acquired on a 3 Tesla magnetic resonance scanner to determine the fat percentage, total and contractile CSA of 20 adult BPI patients. Regions of interest were drawn by two independent investigators to determine the inter-observer reliability. Paired Students' t-test and multivariate analysis were used to relate fat percentage, total and contractile CSA to active flexion and biceps muscle force.ResultsThe mean fat percentage 12 ± 5.1% of affected biceps was higher than 6 ± 1.0% of the non-affected biceps (p < 0.001). The mean contractile CSA 8.1 ± 5.1 cm2 of the affected biceps was lower than 19.4 ± 4.9 cm2 of the non-affected biceps (p < 0.001). The inter-observer reliability was excellent (ICC 0.82 to 0.96). The contractile CSA contributed most to the reduction in active flexion and muscle force.ConclusionQuantitative measurement of fat percentage, total and contractile CSA using three-point Dixon sequences provides an excellent reliability and relates with active flexion and muscle force in BPI. |
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