Medical functional imagery seems to demonstrate that patients suffering from complex regional pain syndrome (CRPS) have cortical modifications that alter their motor (or mental) imagery capacities. Nowadays, the use of motor imagery exercises are used in conventional rehabilitation treatments. But, in clinical practice, no study has verified if patients with CRPS desmonstrate problems in their motor imagery capacities. The MIQ-RS (Motor Imagery Questionnaire - Revised Second) is a valid, reliable and translated into French questionnaire to measure patients' capacities to do mental imagery. In this study, we compare 3 groups of 50 patients : healthy patients, patients with CRPS and patients with musculoskeletal disorder without CRPS. Every patient will take the MIQ-RS for the right and left body side. We hypothesis that patients with CRPS have more deficit than the 2 others to realise motor imagery.

Inclusion Criteria:

• Patient with French healthcare affiliation
• Adult patient (> 18 years old)
• Patient with bachelor degree minimum
• Patient practicing less than 150 minutes of moderate to intense physical activity per week

Specific Inclusion Criteria for CRPS group :

• Patient followed in the Evaluation and Treatment pain center (University Hospital of Nimes)
• Patient with secondary CRPS due to a traumatism or a surgery

Specific Inclusion Criteria for Musculoskeletal group :

• Patient with musculoskelettal disorder on a limb (upper or lower)
• Patient followed in the University Hospital of Nimes

Non inclusion Criteria :

• Patient who participates in another category 1 research
• Patient in a exclusion period in another study
• Patient under legal protection, under guardianship or under curatorship
• Patient for whom it is impossible to give clear information.
• Pregnant, parturient or breastfeeding patient.
• Patient with amputation on one of his limb
• Patient with visual cecity
• Patient who has already practiced mental imagery
• Patient with neurological impairment
• Patient with chronic low back pain and fibromyalgia

Specific non inclusion criteria for Musculoskeletal group and healthy group :

-Patient with CRPS

Specific non inclusion Criteria for CRPS group :

• Secondary CRPS to CVA (cerebrovascular accident)
• Patient receiving lymph node block treatment between the inclusion visit and the follow-up visit

Specific non inclusion Criteria for Musculoskeletal Disorder group :

• Patient with secondary musculoskeletal disorder to a CVA

Exclusion criteria :

• Questionnaire MIQ-RS not completed or non respect with the research protocol
• pathology discovered incompatible with the study criteria