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CompletedNCT01323127Updated Nov 17, 2025

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

An observational study in Back Pain and Low Back Pain, sponsored by Centre Hospitalier Universitaire de Nīmes. Completed at 1 site in France. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-11-17.

Sponsored by Centre Hospitalier Universitaire de Nīmes · Observational

Study type
Observational
Model
Case-control
Time perspective
Prospective
Enrollment
20
Ages
18 Years and older
Sex
All
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Study summary

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.

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Conditions studied

  • Back Pain
  • Low Back Pain
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In context

Back Pain

2,373 studies on the registry are indexed under Back Pain; 284 are open to participants now.

This study's enrollment of 20 is below the median of 100 across 357 observational studies indexed under Back Pain.

Browse Back Pain studies →

Lead sponsor

Centre Hospitalier Universitaire de Nīmes is the lead sponsor of 587 studies on the registry; 96 are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
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.

Eligibility criteria

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
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Study design

Observational model
Case-control
Time perspective
Prospective
Enrollment
20 participants (actual)
Patient registry
No

Groups and cohorts

  • Chronic back pain

    This group of patients has had chronic back pain for longer than 3 months.

    Procedure: Sagital xrays

  • 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

Interventions

  • ProcedureSagital 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.

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What researchers measure

Primary outcomes

  1. % variation in the pelvic incidence angle in sitting compared to standing

    Time frame: Upon xray; day 1

Secondary outcomes

  1. % variation in the sacral slope angle in sitting compared to standing

    Time frame: upon xray; Day 1

  2. % variation in the pelvic tilt angle in sitting compared to standing

    Time frame: upon xray; Day 1

  3. % variation in the lumbar lardosis angle in sitting compared to standing

    Time frame: upon xray; Day 1

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Study locations

1 site
  • Centre Hospitalier Universitaire de Nîmes
    Nîmes, Gard 30029, France
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References and documents

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. PubMed 25956202 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 17, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT01323127
Lead sponsor
Centre Hospitalier Universitaire de Nīmes
Responsible party
Sponsor
First posted
Mar 25, 2011
Start date
Apr 2011
Primary completion
Dec 10, 2011
Completion
Dec 10, 2011
Last update
Nov 17, 2025

Study contacts

Arnaud Dupeyron, MD PhD
principal investigator · Centre Hospitalier Universitaire de Nīmes

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Mar 2015. You cannot join it, but the record below documents what was studied.

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