ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2026
Low back pain during prolonged sitting on a sofa is associated with pelvic posterior tilt in individuals with non-specific chronic low back pain.
Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeNonspecific chronic low back pain (NSCLBP) is a prevalent musculoskeletal disorder often aggravated by prolonged sitting. Previous studies have linked trunk muscle activity and posture to pain development, but their findings were inconsistent. Furthermore, previous studies did not use a backrest, so the study conditions did not reflect real-life conditions. The present study investigated the relationship between pain intensity, pelvic and trunk alignment, and lumbar muscle activity during sofa sitting in individuals with and without NSCLBP.
methodsEighteen participants with NSCLBP and 19 healthy controls sat on a standard sofa for 30 min. Pelvic and trunk angles were measured using a markerless motion capture system, and lumbar longissimus and multifidus muscle activity was recorded via surface electromyography. Pain intensity was assessed using a numerical rating scale.
resultsBoth groups showed significant posterior pelvic tilt and trunk extend after 30 min (Pelvis: mean difference [MD]: -1.64°, 95% CI: -2.64 to -0.64; P = 0.002, Trunk: MD: -3.70°, 95% CI: -6.02 to -1.37; P = 0.003). Numerical rating scale (NRS) scores increased significantly over time (MD: 1.62, 95% CI: 1.13 to 2.12; P < 0.001). No significant changes were observed in lumbar muscle activity and trunk flexion angle relative to the pelvis. In the NSCLBP group, worsening pain correlated with increased posterior pelvic tilt (r = - 0.694, P = 0.001).
conclusionProlonged sofa sitting exacerbates low back pain in patients with NSCLBP, primarily associated with posterior pelvic tilt rather than lumbar muscle activity. Postural guidance encouraging anterior pelvic tilt may help reduce pain during prolonged sitting in daily life.
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