Dec 09

If you don’t have a cauda equina syndrome and you see someone with sciatica which is a rational way to approach it, a brief period of bed rest, followed by active mobilization and therapy with or without modalities as needed acutely, nonsteroidal, most likely some form of analgesics, epidural or oral steroid therapy, that would certainly seem intuitively to be plausible, but again there are very few studies in the literature that document the efficacy in a statistically valid manner. The exception to that was in the Clinical Orthopaedics and related research, just the last issue of the journal, where the study from Scandinavia showing that epidural steroids in a randomized prospective study, may in fact, have some benefit in this pathology, but that is literally hot off the presses. If you take a patient to surgery to remove the disc and the gold standard for that is the so-called microdiscectomy which is essentially an outpatient procedure, you should be just about 100% successful at relieving the sciatica, assuming you have four of these signs, root pain, root irritation, straight leg raising, root compression signs, motor or sensory deficit and a corresponding myelographic or MRI findings, in other words, what you are seeing in the objective imaging modalities, has got to be precisely concordant with the patient’s symptoms and physical examination, and these are older data, but other studies have verified those. Again, remember we are only treating the leg pain, we are not treating the back pain.
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Here is an example of that, here is a patient who presented with a trunk shift, no neurologic deficit, failed to respond to conservative care after eight weeks, was then referred, and you can see the plain films do show the trunk shift, but not much else. This patient came MRI in hand, courtesy of the referring physician, and in fact, MRI shows this very, very large disc prolapse, it’s a pretty old MRI as you can see, which is just about 40% of the cross section area of the canal, and when you have a prolapse that big, most of the time it’s a free fragment, so-called sequestered fragment, it’s actually broken off and this was the homunculus that was removed at the time of surgery, and you can see that was a very large fragment indeed. Patient’s like this are extremely gratifying to treat surgically because literally they will wake up, and in the recovery room, be pain free, and that is a very, very happy patient and a very happy surgeon.
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Dec 08

How about disc herniation? This is kind of the classic disease that Mixer and Bard described in 1934, with disc herniation and prolapse, we’re thinking about sciatica, referred pain, we’re thinking about neuropathic pain, difference in characteristics, neuropathic pain, remember, tends to respond to membrane stabilizing agents, tends to respond to steroids, will respond to narcotics in extremely high doses, if it’s pure neuropathic pain almost to the point of sedation. Mechanical pain on the other hand, tends to respond to narcotics and nonsteroidal anti-inflammatories, so that’s another important differential point. If someone gets a good deal of relief from a narcotic, you should be thinking a little bit more about mechanical pain than you are neurogenic pain. Well of course, a disc herniation results in sciatica, so the main problem here is not back pain, but leg pain. The sciatica can be caused by disc herniation, subarticular stenosis in the area of the foramen and facet, and those degenerative pictures, lateral recess stenosis, again, is an accompaniment of the degenerative cascade. If one decompresses this with a microdiscectomy or laminotomy discectomy, remember you are treating the leg pain only. You are not going to get the patient’s back pain better, in fact, a recent study from Scandinavia has shown that up to 20% of patient’s after a laminotomy discectomy, will have significant enough back pain so as to require additional care of even in some cases, intervention.
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On physical examination, a patient who presents with a trunk shift, should alert you to the possibility of a disc prolapse and sciatica. If you have a disc prolapse far lateral here, so this is coming down on top of the ganglia, the patient will tend to shift away from that, shifting ipsilaterally with provoke the sciatica like-wise, if the prolapse is in the axilla of the root, a contralateral shift will result in sciatica, ipsilateral shift will tend to decompress that. So if you see a patient with a trunk shift that you really can’t reduce, do think about some form of nerve root entrapment.
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Again, here is the slide from Netter and physical examination, this is in the hand-out, as promised coming back to the acute cauda equina syndrome, and this is really the only the only surgical emergency that you are going to see in spine patient’s. This is usually on the basis of a large central disc herniation entrapping multiple nerve roots as shown at the bottom line, clinically, these patient’s will tell you the diagnosis very clearly because they will be some of the most miserably uncomfortable patient’s that you will see. A typical history, as I was unable to find a comfortable position, I tried to sleep sitting in a chair, tried to sleep in flexion, tried to sleep with a trunk shift to unload the neural compression, the classic triad is bilateral sciatica, GU of GI signs and saddle anesthesia from sacral nerve involvement. The GU sign is retention, not incontinence, very important differential point. You may get overflow incontinence if you have a large distended bladder, but incontinence is more frequently due to stress incontinence and has nothing whatsoever to do with spine pathology, so this is somebody with retention. The GI sign again is constipation, not incontinence and that’s because of the involvement of the sympathetics and the sacral nerve roots. If you see someone with this, an immediate MRI or myelogram, immediate surgery and even if you get these patient’s to the operating room within 24 hours, up to 40% still have some neurologic residual.

Dec 07

Conservatively, if you see somebody with back pain very rational approach if they are neurologically intact, and you have done your good physical examination and kind of gone the mental calisthenics that I have outlined, and you decide this is mechanical pain, put them to bed for a very brief period of time, nonsteroidal, perhaps a modality in physical therapy if there is a good deal of soft tissue distress such as muscle spasm, a brief course of ionophoresis, ultrasound may help, before you mobilize the patient into an active physical therapy program, hopefully no later than 10 days after the onset of symptoms. If the patient doesn’t improve and the pain is incapacitating after six to twelve weeks, the next step would be to consider an MRI, that is the first line of investigation. Obviously you are going to be able to screen for tumor or infection, although if you would suspect those based on physical examination or constitutional symptoms, I would hope the MRI would be ordered before that time, but really what you are looking at is gathering information on the degenerative pathology and an attempt to localize the pain generator.
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The problem with localizing the pain generator is the MRI, as you know is very, very sensitive, but very nonspecific. There is a high percentage of degenerative change in many asymptomatic individuals, and that percentage increases as the particular sample ages, so that by the time you are looking at individuals in the 60s or 70s, degenerative changes is ubiquitous, even in asymptomatic individuals with ranges of 85 to 90%. So if you suspect that this degeneration may be the culprit, the next step would be to investigate the disc, and unfortunately, that requires an invasive study and this is obviously the point where you would probably consider a referral. One way to look at the disc is a test called discography, intradiscal injection, not without controversy.
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There two sorts of information available from this, one is the morphology, which you really shouldn’t need if you have a good MRI, but the other is the patient’s clinical response. If you pressurize a symptomatic disc and if the test is done correctly in capable hands, it should recreate the patient’s back pain precisely and enable you to localize the level from which the symptoms originate. North American Spine Society, has formulated guide lines for these, the pain, at least four months long, unresponsive to conservative treatment and other noninvasive modalities, unrevealing. Again, hopefully this would occur relatively rarely, as appropriate conservative care should get most patient’s without neuropathic pain better to the tune of 90 or 95%, but this would be the next line. Facet injections, that is one way to look at whether or not the facet is the culprit, that is a fluoroscopically guided injection which is diagnostic and hopefully therapeutic in some instances, whereby the medial branch of the posterior primary ramus is anesthetized. If that is the pain generator, the patient should get better. There are studies looking at duration of relief, depending on the concentration of the drug used in the facet injections and there has been a positive therapeutic effect assigned to that. There is one school that thought that all facet syndromes are secondary, that they accompany the degenerative symptomatic disc, that again, that is somewhat controversial. How can you treat discogenic pain, well in rare instances, you can perform a spinal fusion, and this is our paper from 1994 where we found we were able to successfully treat that in individuals where the fusion healed. Again, though, if you are operating on someone just for back pain without a deformity, without neurologic features, this should be fewer than 5% of the patient’s that come to your door with this diagnosis.

Dec 04

Medications: Good study showing statistical power for nonsteroidals, analgesics and muscle relaxants, the use of those has to be individualized.

Physical Therapy: Absolutely, there was just a publication in the Journal Spine and that is referenced in your hand-out from the Paris Task Force, looking at the superiority of physical therapy to inactivity and shortening symptomatic intervals, particularly active physical therapy, not modality based therapy, manipulation, hot, cold ice packs, but really active physical therapy.
Low back pain medications:
Muscle relaxants: Soma is a muscle relaxant used to treat pain caused by muscle spasms.

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Manipulation: Believe it or not, there is some very compelling evidence to suggest that may help in the acute phase as with any modality, and by that I mean no more than three to four weeks from the time of onset, chronic manipulation has not been shown to impact long-term health care, delivering a positive sense for low back pain, and injections very controversial despite their wide-spread use, and are used in many individuals. There really are very few studies that demonstrate statistical power as far as the ability of injection to shorten the treatment interval.
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Dec 03

Superficial nonanatomic tenderness, if you touch the patient very lightly and they have exquisite pain, stimulation rotation, if you basically have the patient stand up and rotate the shoulders and the hips together, you are log-rolling them, you are not putting any torsion movement on the spine, if they say they have back pain, where there’s really not a physiologic reason for that, so that would be a positive simulation rotation; axial compression, you put direct compression down on the head, the patient complains of neck pain, that is fine, they complain of back pain, the really shouldn’t because unless you are extraordinarily strong, you are not putting a load on the lower back by compressing the head. Distraction maneuver, straight leg raising maneuver should produce the same results whether the patient is seated or recumbent, regional motor or sensory dysfunction, that’s the stocking glove loss or over reaction. Now as these things were validated, two of the five are still compatible with organic pathology, and that makes sense because you can get a stocking sensory deficit and a peripheral neuropathy with diabetes, so that makes sense. Three of the five, you start to get a little nervous, four would suggest some somatic overlay, five has theological overtones regarding the second coming and inability to have a cure.
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As we move away from physical examination, the treatment of course, is something in which we are very interested and how would you approach these patient’s initially. Well, the lumbar series, we talked about that, certainly in someone over the age of 45, and again, that’s predominantly the rule at a gross lytic lesion. A brief period of bed rest, the current wisdom in that is no more than 48 to 72 hours, Sam Weasel who is at Georgetown did a study in military recruits 100% compliance in that study population, and found that in fact, 48 hours was the optimum duration to shorten the natural history or the duration of the acute flare-up. Traction absolutely of no value whatsoever. A patient, just to overcome soft tissue restraints at the lumbosacral junction, takes about 40% of body weight and trying to administer that force in a reproducible way is very difficult. There are some instruments that are commercially available now, the so-called Vacs Detraction table which is attempting to deliver the force more accurately, but good prospective data on efficacy are notably lacking in that instance.
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Supports: Very, very limited roll, you have probably seen in your institution these kind of belt-like supports with the shoulder straps, well, guess what, if you did flexion extension x-rays on those patient’s, you would see those supports limit range of motion, so they are biomechanically useless and there are some studies that suggest psychologically it might not be the greatest thing to do because the patient has more of a sense of invincibility with in fact, what is a very token support in the biomechanical sense.

Dec 02

A couple of extra things, if you do an active straight leg raising maneuver, that’s just having the patient do a leg lift, hold up both legs at the same time, then do it for 20 seconds, you have ruled out intrathecal pathology because what you’ve done, is you have the patient val salva, you are increasing subarachnoid CSF volume and if the aqua duct is open, no problem, so you have ruled out a tumor. Again, if somebody has back pain with that maneuver, you have reversed the lordosis and you’ve loaded the disc, so that will also give you a clue as to the origin of the back pain.
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Any discussion of physical examination, no matter how brief, would be incomplete without mentioning the nonorganic signs of Waddell. Gordon Waddell who is a Scottish surgeon, described these many years ago and has looked at ways that some of these signs correlate with different aberrations on various psychometric instruments and the way they relate to prognosis. These are thought to be signs of functional or nonorganic or nonorganic pathology. Before we go any further, there is a very important distinction to be made, and that is the distinction between the somatic or hysterical patient, the malingerer. The somatic patient is someone to whom their pain is real. It may not be organically based, but it’s actual, acute distress with pain behavior. The malingerer on the other hand, is someone who is out to consciously defraud the system, and those two people obviously have to be approached very differently, that distinction can be very, very difficult to make, but in fact, in the 12 years I have been doing this, I think I have seen at most really one malinger, so I think that it is fairly uncommon and I would certainly be very, very circumspect before signing that label to any individual. Anyway, what are these nonorganic signs?
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