Inclusion Criteria:  Adult male or female (18 years or older) Patient who has agreed to participate in the study and has read and signed the consent form for participation in the study Patient for whom a minimally invasive spine surgery is planned: (dicectomy, lumbar canal recalibration with or without laminectomy, lumbar arthrodesis by posterior approach limited to one stage)  Exclusion Criteria:  Patient with a contraindication to spinal anaesthesia A bedridden or institutionalised patient Mental deficiency or any other reason that may hinder the understanding or the strict application of the protocol Patient not affiliated to the French social security system Patient under legal protection, guardianship or curatorship Patient already included in another therapeutic study protocol