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

Study Overview
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Brief Summary
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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.

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

Conditions
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Back Pain, Low Back Pain

Intervention / Treatment
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* Procedure: Sagital xrays


Participation Criteria
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Eligibility Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Chronic back pain<br>This group of patients has had chronic back pain for longer than 3 months. | Procedure: Sagital xrays<br>* 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.<br>|
| Non chronic back pain<br>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<br>* 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.<br>|

What is the study measuring?
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Primary Outcome Measures

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

Secondary Outcome Measures

| Outcome Measure | Measure Description | 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 |