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Ann Phys Rehabil Med. 2015 Jun;58(3):151-6. doi: 10.1016/j.rehab.2015.01.003. Epub 2015 May 5.

Effect of a kneeling chair on lumbar curvature in patients with low back pain and healthy controls: A pilot study.

Author information

1
Fédération de médecine physique et de réadaptation, GHU Carémeau, université de Montpellier 1, place du Pr. Robert-Debré, 30029 Nîmes cedex 9, France.
2
Département de médecine physique et de réadaptation, institut universitaire de réadaptation Clémenceau (IURC), 67082 Strasbourg, France.
3
Département de biostatistiques, épidémiologie, santé publique et information médicale (BESPIM), université de Montpellier 1, Nîmes, France.
4
Service central de rééducation, CHU Lapeyronie, université de Montpellier 1, 34295 Montpellier, France.
5
Département de chirurgie orthopédique, GHU Carémeau, université de Montpellier 1, 30029 Nîmes, France.
6
MOVE research institute Amsterdam, faculty of human movement sciences, VU university Amsterdam, Amsterdam, Netherlands; King Abdulaziz University, Jeddah, Saudi Arabia.
7
Fédération de médecine physique et de réadaptation, GHU Carémeau, université de Montpellier 1, place du Pr. Robert-Debré, 30029 Nîmes cedex 9, France; Movement to Health Laboratory (M2H), Montpellier-1 University EuroMov, 34090 Montpellier, France. Electronic address: arnaud.dupeyron@univ-montp1.fr.

Abstract

BACKGROUND:

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.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01323127.

KEYWORDS:

Chair; Low back pain; Lumbar lordosis; Sitting

PMID:
25956202
DOI:
10.1016/j.rehab.2015.01.003
[Indexed for MEDLINE]
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