Relationship between bodyweight and spinopelvic alignment in Chinese adult people: A pilot study
Abstract Background: With the increase of people in obesity, which may affect the alignment of spinopelvic, we designed this study. The purpose of this study is to evaluate the correlation between spinal alignment and the bodyweight parameters in healthy Chinese adult volunteers. That has not been systematically studied yet. Methods: This pilot study included 100 Chinese healthy adult volunteers (36 males and 64 females) who were grouped according to gender. The obesity parameters measured were body mass index (BMI), waist circumference (WC) , sagittal abdominal diameter (SAD), transverse abdominal diameter (TAD) and RR (the ratio of SAD to TAD). The sagittal spinopelvic parameters included Anchorpelvic incidence (PI), pelvic tilt (PT), pelvic angulation (PA), sacral slope (SS), sacral inclination (SI), lumbar lordosis (LL) and the disc angle of L5/S1. The coronal spinopelvic parameters included the Cobb angel of the major curve of the spine, lumbar scoliosis (LS) and pelvic obliquity (PO). Pearson’s correlation analysis was used. Results: The mean BMI of the males and females was 28.7 ± 3.7 kg/m2 and 26.8 ± 2.3 kg/m2 respectively; mean WC, 88.39 ± 9 cm and 82.6 ± 2.7 cm respectively. In the females, strong correlation was found between BMI and PI, WC and PT, and WC and PI. In the males, no strong correlation was found between the obesity and spinopelvic alignment parameters. RR showed a positive linear correlation with PA and PT in both groups. None of the coronal spinopelvic parameters showed a correlation with the obesity parameters in either group. Conclusions: BMI and WC had a strong influence on some spinopelvic parameters, especially in females. In individuals with abdominal obesity, the sagittal spinopelvic alignment is likely to change, but there is little effect on the coronal spinopelvic alignment.