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For the imaging diagnosis of lumbar spinal stenosis, lumbar spine hyperextension position MRI can be a good complement for the routine neutral MRI examination, and it is more sensitive to the clinical diagnosis of lumbar spinal stenosis. For the imaging diagnosis of lumbar spinal stenosis, lumbar spine hyperextension position MRI can be a good complement for the routine neutral MRI examination, and it is more sensitive to the clinical diagnosis of lumbar spinal stenosis. To observe the progress of disease activity and sac