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The standing and sitting sagittal spinopelvic alignment of Chinese young and elderly population: does age influence the differences between the two positions?

Abstract

Purpose

To investigate the characteristics of standing and sitting spinopelvic sagittal alignment among Chinese healthy population with different age groups.

Method

This cross-sectional, prospective study included a total of 235 volunteers aged 19 to 71 years. Volunteers were divided into two groups: group A (age ≤ 40 years; n = 140) and group B (age > 40 years, n = 95). Student’s t test was performed to compare the sagittal parameters including sagittal vertical axis (SVA), T1 pelvic angle (TPA), cervical lordosis (CL), thoracic kyphosis (TK), lumbar lordosis (LL) and pelvic tilt (PT) between standing and sitting positions of two groups. Multiple regression was performed to explore the influence factors of differences between two positions.

Results

In the standing position, group B had larger SVA, TK, PT and TPA than group A. When moving from standing to sitting position, increased SVA and PT were found in both groups, accompanied by decreased LL and TK. However, despite similar change in SVA, group B presented with lesser changes in LL, PT and TPA than group A in sitting position. Age and gender independently influenced the difference in PT and LL.

Conclusion

In the standing position, the older volunteers showed larger SVA, TPA, TK, CL and PT than young population. Both groups showed similar changes when moving from standing to sitting, but the differences between the positions were smaller in older population. These characteristics in the standing and sitting positions of different age groups should be considered when planning surgical reconstruction of sagittal alignment.

Graphic abstract

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Funding

This study was funded by AOSPINE China Research Grant (2017-06).

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Correspondence to Weishi Li.

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Zhou, S., Sun, Z., Li, W. et al. The standing and sitting sagittal spinopelvic alignment of Chinese young and elderly population: does age influence the differences between the two positions?. Eur Spine J 29, 405–412 (2020). https://doi.org/10.1007/s00586-019-06185-w

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  • DOI: https://doi.org/10.1007/s00586-019-06185-w

Keywords

  • Sitting
  • Elderly
  • Spinal deformity
  • Sagittal alignment
  • Standing