Evaluation of Dynamic Stability in the Low Back Pain Patient

General inclusion criteria: * The patient/subject must have given his/her informed and signed consent * The patient/subject must be insured or beneficiary of a health insurance plan Inclusion criteria for low back pain patients: * The patient has chronic low back pain lasting for more than 6 months and which is not postoperative in nature General exclusion criteria: * The patient/subject is participating in another study * The patient/subject is in an exclusion period determined by a previous study * The patient/subject is under judicial protection, under tutorship or curatorship * The patient/subject refuses to sign the consent * It is impossible to correctly inform the patient/subject * The patient/subject is pregnant, parturient, or breastfeeding Exclusion criteria for low back pain patients: * The patient has a history of spinal surgery * The patient has a history of preexisting postural disorder related to lumbalgia * The patient has undergone a localized infiltration treatment (e.g. cortisone shots) in the last month * The subject has a balance disorder, blindness, inability to carry out the experimental protocol Exclusion criteria for healthy volunteers: * The subject has a history of acute low back pain \> 15 days or which has resulted in a work stoppage of more than 7 days in the 5 years preceding the study