This study is to evaluate the correlation between muscle atrophy (MA), sagittal alignment, and stenosis degree in patients with lumbar spinal Stenosis (LSS). From existing radiological images, specific radiographic parameters will be extracted. General Information (Age, sex, levels of stenosis, duration of symptoms) will be extracted from patient files.
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Severity of muscle atrophy (MA) from supine Magnetic Resonance Imaging (MRI) of lumbar spine
Timeframe: single time-point at baseline
Pelvic incidence (PI): Pelvic alignment from standard upright standing sagittal plane X-ray of lumbar spine with clear visibility of pelvis sacrum and femoral heads
Timeframe: single time-point at baseline
Severity of stenosis from supine MRI of lumbar spine
Timeframe: single time-point at baseline
Pelvic tilt (PT): Pelvic alignment from standard upright standing sagittal plane X-ray of lumbar spine with clear visibility of pelvis sacrum and femoral heads
Timeframe: single time-point at baseline
Sacral slope (SS): Pelvic alignment from standard upright standing sagittal plane X-ray of lumbar spine with clear visibility of pelvis sacrum and femoral heads
Timeframe: single time-point at baseline
Lumbar lordosis (LL): Pelvic alignment from standard upright standing sagittal plane X-ray of lumbar spine with clear visibility of pelvis sacrum and femoral heads
Timeframe: single time-point at baseline