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. 2020 Jun 27;17(13):4621.
doi: 10.3390/ijerph17134621.

The Effects of Cross-Legged Sitting on the Trunk and Pelvic Angles and Gluteal Pressure in People with and without Low Back Pain

Kyoung-Sim Jung  1 , Jin-Hwa Jung  2 , Tae-Sung In  1
Affiliations

The Effects of Cross-Legged Sitting on the Trunk and Pelvic Angles and Gluteal Pressure in People with and without Low Back Pain

Kyoung-Sim Jung et al. Int J Environ Res Public Health. .

Abstract

The purpose of this study was to investigate the effects of cross-legged sitting on the trunk flexion angle, pelvic obliquity, and gluteal pressure of subjects with and without low back pain (LBP). The study subjects were 30 LBP patients and 30 healthy individuals. They were instructed to sit on a chair, the height of which was adjustable, so that their knee and hip joints were bent at 90°. All subjects were asked to perform two sitting postures: erect sitting and cross-legged sitting. Trunk flexion angle and pelvic obliquity were measured using a three-dimensional motion-capture system, and gluteal pressure was measured using a force plate. Compared to erect sitting, cross-legged sitting showed a significantly lower trunk flexion angle and greater pelvic obliquity in both groups. Compared to healthy subjects, the patients with LBP had lower trunk flexion angles and greater gluteal pressure asymmetry during cross-legged sitting. The pelvic obliquity was greater in the cross-legged sitting posture than in the erect sitting posture, but there was no difference between the groups. We found that the trunk became more slouched in the cross-legged sitting posture than in the erect sitting posture, and this tendency was more pronounced in patients with LBP.

Keywords: cross-legged sitting; gluteal pressure; pelvic obliquity; trunk flexion angle.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1
Measurement of trunk flexion angle. A: acromion, TFA: trunk flexion angle, GT: greater trochanter.
Figure 2
Figure 2
Mean (standard deviation) of trunk flexion angle during two different sitting postures. * Significantly different within the group. † Significantly different between groups.
Figure 3
Figure 3
Mean (standard deviation) of pelvic obliquity during two different sitting postures.
Figure 4
Figure 4
Mean (standard deviation) of peak pressure ratio during two different sitting postures. * Significantly different within the group. † Significantly different between groups.
See this image and copyright information in PMC

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