Study Of The Efficacy Of Neurolysis In Functional Recovery From Chronic Nonspecific Low Back Pain
NCT ID: NCT01190033
Last Updated: 2013-03-26
Study Results
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Basic Information
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UNKNOWN
NA
40 participants
INTERVENTIONAL
2010-08-31
2013-07-31
Brief Summary
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Procedures After the initial screening the patients will undergo diagnostic blocks of the medial branch of lumbar vertebrae L2, L3, L4 , L5 and of the first sacral vertebra (S1) with lidocaine and control with distilled water. The patients that present more than 50% of pain improvement, evaluated by the Likert scale after 30 minutes will form the study group, while the patients that do not present pain improvement with lidocaine or that present pain improvement with distilled water will be excluded.
The medial branch block consists of the insertion of a 90mm, 25-gauge needle through the skin with radioscopic control up to the medial branch topography. Infusion of 1ml of 2% lidocaine should be performed in each medial branch of the abovementioned vertebrae. Control is executed in the same manner yet with infusion of 1ml of distilled water.
Through the use of the diagnostic block we will have 40 patients selected for the second phase of the study. Once defined the study group should be evaluated before the procedure through the Oswestry, Roland Morris, SF-36 and VAS questionnaires.
In the second phase of the study the patients will be randomized. The random division into two groups will be performed through a computerized program of random numbers. The randomization result will be kept in matt sealed envelopes to guarantee secrecy of the allocation. The neurolysis procedure will be carried out in the first group, consisting of 20 patients, and the placebo or sham procedure with the second group, also with 20 patients.
The neurolysis procedure will be carried out under sterile conditions, with the patient lying prone and with the neurotome insertion sites anesthetized with 2ml of 1% lidocaine. The neurotome (Smith \& Nephew - RF) will be used for the procedure. The neurotome is a radiofrequency apparatus mounted on a 10cm electrode type 22 needle with a 5mm exposure tip. The neurotome should be introduced percutaneously in a manner similar to that adopted in the medial branch block through radioscopic control. The temperature of the electrode after its placement in the correct position is then raised to 80 °C for 90 seconds. Two neurotomies should be performed for each facet, one proximally and the other distally, due to double innervation of each facet. In the patients of the placebo group the procedure will be the same only the temperature of the neurotome will not be raised. This will be performed in a blind manner, as before starting the procedure, the surgeon will show the assistant who turns the device on or not the envelope containing the patient's group (placebo or neurotomy), yet the surgeon will not be informed whether the device has been turned on or not, having to perform the procedure in the same manner in both groups.
The patients will then be reevaluated in the first month, 3 months after, 6 months after and 12 months after the procedure. The assessors will not be informed of the group to which the patient belongs, and the same scales performed in the preoperative period will be used here.
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
PARALLEL
TREATMENT
QUADRUPLE
Study Groups
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Neurolysis
In this intervention the neurotome will be connected
neurolysis
In this procedure the neurotome will be connected
Neurotome OFF
neurotome not raised
Neurotome OFF
In this intervention the neurotome will be unconnected.
Interventions
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Neurotome OFF
In this intervention the neurotome will be unconnected.
neurolysis
In this procedure the neurotome will be connected
Eligibility Criteria
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Inclusion Criteria
* present clinical complaints of low back pain for 3 months or more.
* present pain of moderate to severe intensity: visual analogue scale (VAS) \> 4.
Exclusion Criteria
* patients that request their withdrawal from the study at any time.
* patients that develop an allergy to the medication used.
18 Years
65 Years
ALL
No
Sponsors
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University of Sao Paulo
OTHER
Responsible Party
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Alexandre F. Cristante
PhD.
Locations
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Institute of Orthopedics and Traumatology of the U.S.P
São Paulo, São Paulo, Brazil
Countries
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Facility Contacts
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Other Identifiers
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iot 803
Identifier Type: OTHER
Identifier Source: secondary_id
RIZT2010
Identifier Type: -
Identifier Source: org_study_id
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