Article

The concept of an ideal sitting posture is often used in practice but
lacks a basis in evidence. OBJECTIVE: We designed a cross-sectional, comparative,
matched study to determine the effects of chair and posture on lumbar curvature
in 10 patients with chronic non-specific low back pain (CLBP; mean pain duration
24 +/- 18 months) and 10 healthy matched controls.
METHODS: Pelvic incidence,
sacral slope and lumbar curvature were measured on computed radiographs by 2
blinded clinicians for subjects in 2 postures (upright vs slumped sitting) and on
2 chairs (usual flat chair vs kneeling chair). RESULTS: The reliability of
measures was excellent (intraclass correlation coefficient>0.9). As hypothesized,
the expected sacral slope and lumbar lordosis changed between standing and
sitting on a kneeling chair as compared with a usual chair (P<0.0001) and less in
patients than controls (P=0.046) for lordosis only. In addition, as expected,
changes were more pronounced with slumped than upright sitting (P<0.0001). An
interaction between chairs and postures for lumbar lordosis (P=0.02) indicated
more pronounced effects of the chair in slumped sitting. Therefore, lumbar
lordosis was reduced less when sitting on a kneeling chair as compared with a
usual chair. CONCLUSIONS: Although healthy subjects showed more reduction in
lordosis between standing and sitting, the chair effect was found in both CLBP
patients and healthy subjects.
CI - Copyright (c) 2015 Elsevier Masson SAS. All rights reserved.

Langue : ANGLAIS