Inclusion Criteria :  Major subject Consent for the study Patients eligible for orthopedic surgery with local anesthetic block Estimated duration of the Orthopedic surgery of minimum 1 hour  Exclusion Criteria :  Age < 18 years, Age > 75 years, Known central neurological pathology/cognitive impairment, Mini-Mental State examination (MMSe) < 23 if no school certificate, < 27 if school certificate, History of vertigo, Claustrophobia, Visual deficit not compatible with the use of the virtual reality mask, Contraindication to surgery, Outpatient treatment, Refusal or inability to consent.