Body Schema Alterations in Musculoskeletal Disorders : Effect of Laterality

Study Overview
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Brief Summary
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This study assess ocular movements in a hand laterality judgment task in a population of musculoskeletal disorders. Reaction time, error rate and visual strategy are compared between musculoskeletal disorders and healthy patients, and between the different locations of the disorder.

Detailed Description
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Musculoskeletal disorders are a major public health issue. Recent studies showed that body schema alterations are involved in the chronification of those disorders. Those alterations bring the opportunity for new exploration or therapeutic solutions. Our hypothesis is that musculoskeletal disorders lead to motor imagery alterations relative to body schema disorders. Reaction time extension et error rate increase in a hand laterality judgment task would confirm that hypothesis. It is assumed that body schema alterations of patients suffering from musculoskeletal disorders could change with localisation, dependant on disorder's laterality and distality. It is a monocentric, prospective, case-control trial, with 4 subgroups of 30 patients : shoulder rotator cuff tendinopathy, carpal tunnel syndrome, chronic low back pain, healthy subjects. We compare reaction time and error rate on a hand laterality judgement task. In that task, participants are asked to identify hand right or left laterality, when those hand is presented on a computer screen, by answering with the keyboard. Hands are shown on palmar or dorsal view and with 12 different angles of rotation. An eye-tracking device register participant eye movements during the task.

Official Title
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Body Schema Alterations in Patients Suffering From Musculoskeletal Disorders. Does Disorder Laterality Influence Recruitment of Cerebral Areas Involved in Voluntary Motricity?

Conditions
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Musculoskeletal Disorder, Rotator Cuff Tendinitis, Chronic Low Back Pain, Carpal Tunnel Syndrome

Intervention / Treatment
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* Other: hand laterality judgment task


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: normal visual acuity social security affiliation signing consent rotator cuff tendinopathy, chronic low back pain, carpal tunnel syndrome or healthy subject Exclusion Criteria: recent trauma or surgery psychiatric or neurological disorder psychotropic consumption previous experience with motor imagery bad french comprehension protected persons other painful affection than the inclusion criteria

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Shoulder rotator cuff tendinopathy<br>unilateral rotator cuff tendinopathy, 3 months or more duration, confirmed by imagery, | Other: hand laterality judgment task<br>* participants are asked to identify laterality of the hand presented on the screen<br>|
| chronic low back pain<br>non specific chronic (3 months) low back pain | Other: hand laterality judgment task<br>* participants are asked to identify laterality of the hand presented on the screen<br>|
| carpal tunnel syndrome<br>unilateral carpal tunnel syndrome, confirmed by electromyogram, 3 months or more duration | Other: hand laterality judgment task<br>* participants are asked to identify laterality of the hand presented on the screen<br>|
| control<br>healthy subjects | Other: hand laterality judgment task<br>* participants are asked to identify laterality of the hand presented on the screen<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| error rate at the hand laterality judgment task | number of errors divided by the total number of hands presented | 1 hour | 
| reaction time | time to press on the keyboard the answer Right or Left after the hand was presented | 1 hour | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| visual strategy | assessment of the image's areas most fixed with the eyes | 1 hour |