Common and Specific Information From Neuroimaging and Smartphone

Inclusion Criteria : * Diagnosis of MS based on McDonald criteria (including Relapsing-remitting and progressive MS) * Over 18 years old /age greater than 18 years * Patients followed at Nantes university hospital or Rennes university hospital * Last known EDSS before inclusion ranging from 0 to 6 inclusive/EDSS of 0 to 6 inclusive, prior inclusion * No relapse within 3 months * With a Medullar MRI planed as part as usual care * MRI scan can be performed within a maximum of 4 months after or before the walking test. * Affiliated person or beneficiary of a social security scheme Exclusion Criteria : * Bilateral aid needed to walk * Women who are pregnant * Patient having expressed their opposition * Patient under guardianship or security measure