Lumbar Proprioception in Lower Back Pain Patients Versus Healthy Subjects : a Comparative Study on the Effects of Low- and High-frequency Muscle Vibrations
Lumbar Proprioception in Lower Back Pain Patients Versus Healthy Subjects : a Comparative Study on the Effects of Low- and High-frequency Muscle Vibrations
The primary objective of this study is to compare the lumbar proprioception of patients with
 chronic back pain to that of healthy volunteers during low- and high-frequency muscle
 vibration.

 The order of measures (low frequency of vibration, high frequency vibration and no vibration)
 is randomized in a cross-over design.

 Patients and volunteers are matched by age and body mass index.
The secondary objectives of this study are:

 A-Measure the effect of low- and high-frequency vibrations on lumbar repositioning in
 patients with chronic lower back pain.

 B-Measure the effect of low- and high-frequency vibrations on lumbar repositioning in healthy
 volunteers.

 Our working hypothesis is that low frequency vibrations induce an illusion of shortening, and
 high frequency vibrations induce an illusion of elongation. The variability of the error
 should not increase.
Inclusion Criteria for patients:

 -  The patient must have given his/her informed and signed consent

 -  The patient must be insured or beneficiary of a health insurance plan

 -  The patient has had chronic low back pain (which did NOT originate in a postoperative
 setting) for at least 6 months

 Inclusion Criteria for healthy volunteers:

 -  The subject must have given his/her informed and signed consent

 -  The subject must be insured or beneficiary of a health insurance plan

 Exclusion Criteria for patients:

 -  The patient is under judicial protection, or any kind of guardianship

 -  The patient refuses to sign the consent

 -  It is impossible to correctly inform the patient

 -  The patient is pregnant, parturient, or breastfeeding

 -  The patient has a history of spinal surgery

 -  The patient has a history of preexisting postural disorder preceding low back pain

 -  The patient has been treated in the last month (e.g. back pain injections)

 -  The patient has a balance disorder, blindness, inability to perform the experimental
 protocol

 Exclusion Criteria for healthy volunteers:

 -  The subject is under judicial protection, or any kind of guardianship

 -  The subject refuses to sign the consent

 -  It is impossible to correctly inform the subject

 -  The subject is pregnant, parturient, or breastfeeding

 -  The subject has a history of spinal surgery

 -  The subject has a history of preexisting postural disorder preceding low back pain

 -  The subject has been treated in the last month (e.g. back pain injections)

 -  The subject has a balance disorder, blindness, inability to perform the experimental
 protocol

 -  The subject has a history of acute low back pain > 15 days or which has resulted in
 leave from work for more than 7 days in the 5 years preceding the study