Lumbar Selective Nerve Root Block
What is a lumbar selective nerve root block and why do I need it?
A selective nerve root block is an injection of a local anaesthetic along a specific nerve root. Along the spine, there are several “holes” or “foramina” through which the nerve roots emerge. If these foramina are partially obstructed by bulging discs, bone spurs or misalignment of vertebrae, the nerve root can be pinched. This typically causes a shooting or radiating pain along that nerve root. In a selective nerve root block, a small needle is placed in the foramen alongside the nerve root and the medication is injected.
This procedure is commonly requested by our spine surgeons to determine the exact level that needs to be operated to relieve the nerves that are pinched. This is because the MRI scan of the spine could be inconclusive when two are three foramen are involved.
How is it done?
Blood thinning medicines must be stopped prior to your procedure, and we will advise you regarding that at Atlas Pain Care, Coimbatore. In the procedure room, you will be assisted into a position that involves lying on your tummy.
An X-ray will then be used to determine where the needle should be placed. The skin on the back is cleaned with antiseptic solution. Following infiltration of local anaesthesia to reduce skin discomfort during the procedure, the needle is placed and guided to the foramen under image control. Once correct placement is confirmed with a dye, local anaesthetic and other medications are injected. The procedure takes not more than 15 minutes, following which you will be observed in the recovery room for an hour and discharged home later.
What should I expect after the injection?
Immediately after the injection, you may feel that your leg is slightly heavy or numb. This is due to the nerve block. You may notice that you are pain free or the pain considerably less. This is due to the effect of the local anaesthetic and it lasts for a few hours. Your pain may return after a day or two and you may have some soreness at the injection site for a day. You will be advised to take rest for a day after the procedure and perform activities as tolerated.
What are the possible risks and side effects?
Overall, the procedure has very few risks. Commonly encountered side effect includes increased pain over the injection site, which is temporary. Complications like headache, bleeding, infection, nerve damage and no relief from your spinal pain are rare. Please read our FAQ section to know more about the do's and don'ts prior to and after the procedure.