The first report on normal sagittal spinopelvic alignment of Japanese population using EOS imaging

Methods One-hundred thirty six volunteers (male:34, female:102, mean BMI=21.1) who have no history of spinal diseases were enrolled. The average age was 39.5 years (20 ~ 69). Spino-pelvic alignments (T1/T12 kyphosis, Lumbar Lordosis [LL], Sacral Slope [SS], Pelvic tilt [PT], Pelvic Incidence [PI], T9-hip axis sagittal angle [T9ang], and sagittal vertical axis [SVA]) were measured using the EOS imaging system which was firstly installed in Japan. The subjects were divided into 5 generations: 20’s (n=30), 30’s (n=43), 40’s (n=35), 50’s (n=20), and 60’s (n=8). Then, the data were compared among the generations.