Differentially Diagnosing a Lumbar Nerve Root Adhesion

F3_smallAs PTs, we often get referrals to treat low back pain, lumbar strains, etc.  With these referrals, we often do a good job at determining a diagnoses by provoking or alleviating symptoms but don’t always do the best job at determining the origin of symptoms. A commonly overlooked syndrome at the low back is a nerve root adhesion.  A nerve root adhesion often presents with signs and symptoms of of:

  • “dull ache” in buttocks which increases to sharp, burning sensation when attempting to “stretch out”.  This pain is provoked at endrange.
  • “better to walk or weight bear but sitting is not unbearable”
  • “stiffness after sitting for long periods of time”. Upon physicial assessment, hypomobile segment (s) are noted
  • (-)SLR, (+) Slump tests
  • Repeated trunk flexion in standing causes increased symptoms but bending the knees and repeating this is pain free. (tip: In patients with herniated discs, repeated trunk flexion will cause increased symptoms regardless of knee flexion or extension).

I often will treat these individuals with neurodynamic techniques and will make the Slump test the first exercise.  I modify it by instructing the patient to extend their knee and dorsiflex their ankle as they extend their neck and flex their knee and plantarflex their ankle as they flex their neck.  Patients will often get discomfort if they go to endrange, so I instruct them to only go to the point just before they experience discomfort.  This technique is often effective in reducing symptoms but may have not been performed if I didn’t accurately find the origin of symptoms and started with segmental mobility activities.  If we have the tools and knowledge to accurately identify the origin of symptoms in the assessment, we will continue to give the most optimal care.

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joseph,

david poulter came up with a great little technique for treating nuerological “tightness” symptoms called retlouping. it works wonders with people with low back pain and “hamstring tightness.”

here is a youtube video of it being done:
http://www.youtube.com/watch?v=u3BwXOkbWCo

posted by ryan orser on 11.30.10 at 7:30 am

Nice article. This is the process I generally use for back pain differential diagnosis.

I like to use a step stool and place the affected extremity’s foot on the stool. Then I have them perform forward flexion and note if there is a difference.

Modification of the slump test is a great treatment technique along with retlouping. Great article and more people should be able to recognize this in patient’s with back pain.

posted by Hunter Stark on 11.30.10 at 11:09 am

Great post! Look forward to hearing more from you in the future. I really enjoy with neurodynamic techniques and have been dabbling in some research. We currently have 1 article published on the role of neural tension in hamstring flexibility and we also have 2 follow up papers which should be coming out in the next few months.

posted by Christopher Johnson on 11.30.10 at 3:45 pm

I am not so sure how this procedure will actually demonstrate that the pain source is an adherant nerve root. It certainly confirms that the pain source is responsive to the slump manouvre, but how sure can you be that there is not a local muscular source within the buttock, for example the sciatic nerve interface within or adjacent to piriformis, that may also respond to local treatment such as dry needling / acupunture? It is also worth noting the extensive fascial connections throughout the spinal extensor group and through the pelvis (see research by Briggs and Barker published in Spine in 2002/3/ or 4 which theoretically can connect cranial/cervcial movements throught to movement of the lower limb. Essentially this very useful technique assesses or treats a movement impairment of a group (or tract perhaps) of tissues rather than a specific structure, but is probably not so valuable as a ‘diagnostic’ test.

posted by roy rogers on 12.15.10 at 3:50 am

Thanks for the comments Roy and you do have a good arguement. While yes, the specificity of this test may not be 100% I do believe it is a good tool for looking at a neurogenic root of pain vs. a disc herniation.

In terms of piriformis syndrome, a patient would have a + SLR by definition. In the diagnostic criteria I provided for a nerve root adhesion, a SLR would be -. This stated, there are always false negatives and we shouldn’t rely soley on one test to rule out a condition so I also included “walking and weightbearing is better” and in a true piriformis syndrome, walking would be worse.

In terms of fascial restrictions being the source of pain, the descriptors of a “sharp, burning” pain would make me consider the pain to be neurogenic in nature vs. fascial. Also the + Slump test is one of our best special tests at identifying neural adhesions (it actually also increases disc pressure so we can differentiate between both with the repeated flexion testwith knees extended and flexed).

Its the cluster of + signs and symptoms I provided which would cause me to think that the patient has an nerve root adhesion vs. something else. That stated, if the patient didn’t respond favorably to the neural flossing techniques I would perform, then yes I would reassess and maybe consider other conditions which can present similarly.

posted by Joseph Brence on 12.15.10 at 6:41 am

Great site. A lot of useful information here. I’m sending it to some friends!

posted by physical therapist on 12.20.10 at 11:50 pm

What about nerve gliding techniques as one treatment suggestion?

posted by Kayla on 04.11.11 at 4:13 am

Kayla,
Actually in the last paragraph of this article I state I would use neurodynamic techniques and a modified Slump…These are “neural flossing” interventions…May have missed this

posted by Joe Brence on 04.11.11 at 4:38 pm

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