Preliminary Study of the Sagittal Alignment of the Lumbo-pelvic Complex in a Sitting Position

The main objective of this study is to investigate the influence of seat type (straight chair versus "ergonomic" chair) on the sagittal alignment of the lumbo-pelvic complex in two different postures compared to standing for each individual in both a chronic-back-pain and a non-chronic-back-pain population.

Study Overview

• Status: Completed
• Conditions: Back Pain; Low Back Pain
• Intervention / Treatment: Procedure: Sagital xrays

• Study Type: Observational
• Enrollment (Actual): 20

Contacts and Locations

Study Locations

• France
  • Gard
    • Nîmes, Gard, France, 30029
      • Centre Hospitalier Universitaire de Nīmes

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

Two populations are compared: one with chronic back pain, and the other a group of hospitalized patients with no lombo-peliven complications.

Description

General Inclusion Criteria:

• The patient must have given his/her informed and signed consent
• The patient must be insured or beneficiary of a health insurance plan

Inclusion Criteria for the Chronic Back Pain Group

• Patient has chronic lombalgia (> 3 months)
• Patient has discopathy evidenced by standard imaging of the lumbar spine

Inclusion Criteria for the Non Chronic Back Pain Group

• Patient does not have chronic lombalgia or neurological symptoms
• Patients hospitalized for cardiovascular physical therapy which does not interfere with the sagital alignment of the lombo-pelivien complex (post-infarctus care, cardiac insufficiency)

Exclusion Criteria:

• The patient is participating in another study
• The patient is in an exclusion period determined by a previous study
• The patient is under judicial protection, under tutorship or curatorship
• The patient refuses to sign the consent
• It is impossible to correctly inform the patient
• The subject has had more than two x-rays, or similar ray exposure during the previous year
• The subject has a professional activity or hobby that exposes him/her to radiation
• The subject has a lombo-pelivien malformation

Study Plan

How is the study designed?

Design Details

• Observational Models: Case-Control
• Time Perspectives: Prospective

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Chronic back pain; This group of patients has had chronic back pain for longer than 3 months.	Procedure: Sagital xrays; 5 xrays will be taken: (1) Upright standing position; (2) Upright, straight chair position; (3) Slouching, straight chair position; (4) Upright, ergonomic chair position; (5) Slouching, ergonomic chair position.
Non chronic back pain; This group of patients is hospitalized for cardio physical therapy, and has no lumbar-pelvic complications. Patients are selected from the hospitalized population according to age, sex, and BMI in order to match chronic back pain patients.	Procedure: Sagital xrays; 5 xrays will be taken: (1) Upright standing position; (2) Upright, straight chair position; (3) Slouching, straight chair position; (4) Upright, ergonomic chair position; (5) Slouching, ergonomic chair position.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
% variation in the pelvic incidence angle in sitting compared to standing	Upon xray; day 1

Secondary Outcome Measures

Outcome Measure	Time Frame
% variation in the sacral slope angle in sitting compared to standing	upon xray; Day 1
% variation in the pelvic tilt angle in sitting compared to standing	upon xray; Day 1
% variation in the lumbar lardosis angle in sitting compared to standing	upon xray; Day 1

Collaborators and Investigators

• Sponsor: Centre Hospitalier Universitaire de Nīmes
• Investigators: Principal Investigator: Arnaud Dupeyron, MD PhD, Centre Hospitalier Universitaire de Nīmes

Publications and helpful links

General Publications

• Vaucher M, Isner-Horobeti ME, Demattei C, Alonso S, Herisson C, Kouyoumdjian P, van Dieen JH, Dupeyron A. Effect of a kneeling chair on lumbar curvature in patients with low back pain and healthy controls: A pilot study. Ann Phys Rehabil Med. 2015 Jun;58(3):151-6. doi: 10.1016/j.rehab.2015.01.003. Epub 2015 May 5.

Study record dates

Study Major Dates

• Study Start: April 1, 2011
• Primary Completion (Actual): December 10, 2011
• Study Completion (Actual): December 10, 2011

Study Registration Dates

• First Submitted: March 24, 2011
• First Submitted That Met QC Criteria: March 24, 2011
• First Posted (Estimated): March 25, 2011

Study Record Updates

• Last Update Posted (Estimated): November 17, 2025
• Last Update Submitted That Met QC Criteria: November 14, 2025
• Last Verified: March 1, 2015

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pain; Neurologic Manifestations; Pathological Conditions, Signs and Symptoms; Signs and Symptoms; Back Pain; Low Back Pain
• Other Study ID Numbers: LOCAL/2010/AD-03; 2010-A01536-33 (Other Identifier: ANSM)