Spinal Kinematics Variability

Study Overview
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Brief Summary
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This study will test the within and between day variability of spinal kinematics and trunk muscle activity in healthy subjects and chronic low back pain patients during various daily-life activities.

Detailed Description
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This study will test the within and between day variability of spinal kinematics and trunk muscle activity in healthy subjects and chronic low back pain patients during various daily-life activities. Participants will come twice to the motion laboratory. During the first session, participants will first perform different functional activities (V1), such as sit-to-stand, gait, lifting tasks, stepping up. Their spinal kinematics will be measured with a camera-based system (VICON) using a multi-segment spinal model and trunk muscles activity will be recorded with surface electromyography. After a break, participants will have to perform all the functional activities a second time (V2). These two measures (V1 and V2) will be used to determine the within day variability of spinal kinematics. Finally, all participants will come one week later (V3) to repeat all the measurements to determine the between day variability.

Official Title
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Spinal Kinematics Variability in Healthy Subjects and Patients With Chronic Low Back Pain in Different Functional Activities

Conditions
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Chronic Low Back Pain

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: sufficient French level to understand the instructions for the tests, the information sheet, the consent form and the questionnaires All chronic low back pain patients should present with non-specific low back pain (pain from lower ribs to gluteal folds) for more than 3 months. Exclusion Criteria: pregnancy body mass index (BMI) that is above 32 patients should not have any sign of specific low back pain such as the presence of infection, rheumatological or neurological diseases, spinal fractures, any known important spinal deformities, previous back surgery that limits spinal mobility, tumours high level of pain at the time of experiment that prevents repeated movements (severity and irritability) other concomitant pain or condition that could compromise the evaluation of spinal kinematics.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Chronic low back pain patients<br> | |
| Asymptomatic subjects<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Spinal kinematics | Range of movement at the lower lumbar, upper lumbar, lower thoracic and upper thoracic joints | Change between measure 1 and measure 2 (30 minutes later) | 
| Trunk muscle activity | Surface electromyography of paraspinal, rectus abdominis and external obliques muscles | Change between measure 1 and measure 2 (30 minutes later) | 
| Spinal kinematics | Range of movement at the lower lumbar, upper lumbar, lower thoracic and upper thoracic joints | Change between measure 1 and measure 3 (day 7) | 
| Trunk muscle activity | Surface electromyography of paraspinal, rectus abdominis and external obliques muscles | Change between measure 1 and measure 3 (day 7) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pain intensity | Pain intensity will be quantified by the 11-point Numeric Pain Rating Scale. The scale range from 0 (no pain at all) to 10 (worst pain). | Measure 1 (Day 0), Measure 3 (Day 7) | 
| Disability | Disability will be quantified by the Patient Specific Functional Scale. The scale assessed three relevant activities for the patient and scores each activity between 0 (impossible to realize the activity) to 10 (capable of doing the activity normally). | Measure 1 (Day 0), Measure 3 (Day 7) | 
| Disability (ODI) | Oswestry Disability Questionnaire. Score between 0 (no disability) and 100. | Measure 1 (Day 0), Measure 3 (Day 7). | 
| Kinesiophobia | Tampa Scale of Kinesiophobia. The total score is between 17 (no kinesiophobia) to 68 (high level of kinesiophobia). | Measure 1 (Day 0), Measure 3 (Day 7). | 
| Catastrophizing | Pain Catastrophizing Scale. Score between 0 and 52 (high levels of catastrophizing). | Measure 1 (Day 0), Measure 3 (Day 7). | 
| Back Pain Attitudes Questionnaire | Back Pain Attitudes Questionnaire. Score between 34 (positive attitudes) and 170 (negative attitudes) | Measure 1 (Day 0), Measure 3 (Day 7). | 
| Fear | Fear scale measured before each movement or activity. Score between 0 (no fear) and 10 (high levels of fear). | Measure 1 (Day 0), Measure 2 (Day 0), Measure 3 (Day 7). | 
| Pain expectation | Pain expectation scale before each movement or activity. Score between 0 (no pain expected) and 10 (high levels of pain expected). | Measure 1 (Day 0), Measure 2 (Day 0), Measure 3 (Day 7). |