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.
Highlights
Adolescents and adults spend an average of 7.7 h a day sitting [1]
Informed consent was voluntarily obtained from all subjects before participation in our study, which was approved by the Institutional Review Board (IRB) of Gachon
Murphy et al [21] reported that a flexed posture is significantly correlated with low back pain (LBP)
Summary
The lordosis in the sitting posture decreases compared to that in the standing posture [2,3]. Studies that investigated the natural sitting posture of patients with low back pain (LBP) showed decreased lumbar lordosis and increased cervical lordosis and thoracic kyphosis compared to erect sitting postures [7]. Studies comparing the sitting postures of subjects with and without chronic LBP reported that the LBP group showed an asymmetrical distribution of body weight [8] and decreased activity of the internal obliques [9] compared to the control group. Fann [10] compared posture asymmetry in patients with LBP in a standing posture and observed no significant difference in pelvic obliquity between subjects with and without chronic lower back pain
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