FASCIAL ADHESIONS, CHRONIC PAIN, AND CUTANEOUS NERVE ENTRAPMENTS
MORE COMMON THAN YOU EVER DREAMED!
- DERMATOMAL PAIN PATTERNS: In the same way that we know which nerves control what organs, we also know what specific areas of sensation are controlled by each spinal nerve. These areas are known as dermatomes. In other words, a dermatome refers to the area of skin innervated by a single spinal nerve. For instance, if a person had severe pain in a dermatomal pattern on their abdomen, it would not be a shock to see them break out with SHINGLES a day or two later (the herpes zoster / chickenpox virus hides in the nerve root and attacks the length of said nerve if a person BECOMES OVER-STRESSED or has a weakened immune system). Dermatomes are what allow us to look at what part of a patient's hand is numb and tell what nerve is the likeliest one being pinched in the neck or upper back. Dermatomal patterns of sensation are seen in the pics above, and while cutaneous nerve entrapments will often create patterns similar to dermatomal patterns, they are usually not an exact match.
- MYOTOMAL PATTERNS OF DYSFUNCTION: Myotomes are the muscle's equivalent of the dermatome, except that they are measures of motor function instead of sensory. In other words, a myotome is muscle or group of muscles controlled by a specific spinal nerve. So if we've figured out what dermatome is affected in our patient, we can start testing things like grip strength, the ability to spread one's fingers against resistance, or maybe the ability to stand on one's heels or toes, to see if the dermatomal level of lesion matches the myotomal level. Again, myotomes are a motor issue, not sensory (which does not mean that muscles cannot be a source of pain).
- SCLERATOMAL OR SCLERATOGENOUS PAIN PATTERNS: The Scleratome refers to all the deep tissues that are controlled / innervated by a specific spinal nerve. Scleratogenous patterns of pain go back to embryonic development (again, the somite) and encompasses the specific referral patterns of specific deep tissues (bone, cartilage, LIGAMENTS, TENDONS) controlled by a specific spinal nerve.
- TRIGGER POINT PAIN REFERRAL PATTERNS AND TENDER POINTS: I have written extensively about TRIGGER POINTS and their pain referral patterns ("Tender Points" are said to be Trigger Points that do not refer pain, but are locally painful).
- VISCERAL PAIN REFERRAL PATTERNS: The soma refers to the body (think "somite" here) and the viscera refers to the organs. And yes, organs have specific referral patterns as well, although far less is known about them than somatic pain referral. Visceral referral is thought to arise from a combination of embryological origins, the level of spinal cord innervation / nerve supply, and yes, the fascial connections that are found throughout the organ systems (the last pic at the bottom of the post has a diagram showing visceral pain referral patterns from specific organs).
As you can see, there are a lot of ways to refer pain, which is why it can sometimes be difficult to nail down exactly what is going on in a suffering individual. What I want to do now is talk about still another mode of potential pain referral -- the entrapment of cutaneous nerves in superficial connective tissues, i.e fascia.
Are entrapment syndromes of the cutaneous nerves real, or am I blowing a lot of hot air here. Although YESTERDAY'S POST on entrapment of the Superior Cluneal Nerve (SCN) should have answered this question, we'll delve in a bit deeper today and talk about other entrapment syndromes regarding other cutaneous nerves. Before we do, I want you to understand that it is in the cutaneous nerves where we find SMALL FIBER NEUROPATHY --- one of the hallmarks of FIBROMYALGIA (the only surefire way of testing for this problem is via biopsy). People with small fiber neuropathy typically struggle with numbness, tingling, burning, and other paresthesias of the extremities, and it's not uncommon that they have hypersensitivity to heat, cold, or both, as well. Whatever the source of pain, science is increasingly insistent that dealing with it is critical in order to diminish the chances of developing CENTRAL SENSITIZATION.
"Nerves travel to the upper and lower extremities and traverse the various joints along their paths. Unfortunately, these nerves can become compressed or entrapped at various regions of the extremities, especially at "tunnel" regions, where they may be predisposed or vulnerable to compression. Neurosurgeons, among other surgical specialists treat these entrapment neuropathies, which can account for 10-20% of a practice’s cases." From a September 2017 article for Medscape (Nerve Entrapment Syndromes) written by a group of neurosurgeons, orthopedic surgeons, and plastic surgeons.
Now that we've ascertained that nerve entrapments are not only real, but common as well, it would be helpful to have some kind of idea of how common they are --- particularly entrapments of the cutaneous nerves. Some are so common that they have their own name. For instance, when there is entrapment of the Lateral Femoral Cutaneous Nerve (LFCN), it is known as 'Meralgia Paraesthetica' (MP). Although its symptoms are different (sensitivity to light touch, sensitivity to temperature extremes, buttock or groin pain, problem worse with tight pants, constant pain, burning, stinging, etc), MP is sometimes confused with IT-BAND issues due to its proximity.
Because one of the more common types of pain is abdominal pain, it is likewise important to realize that the RIB CAGE and ABDOMEN are not uncommon areas to find entrapments of cutaneous nerves. For instance, the May 2014 issue of Continuing Education in Anaesthesia Critical Care & Pain (Abdominal Cutaneous Nerve Entrapment Syndrome) stated, "Abdominal cutaneous nerve entrapment syndrome is a frequently overlooked diagnosis in patients with abdominal pain. Patients have often undergone a plethora of investigations, including diagnostic surgery and psychiatric review, before referral to Pain Management Services... resulting in significant anxiety, distress, and loss of work days for the patient. Up to 30% of patients with chronic abdominal pain have pain originating in the abdominal wall and abdominal cutaneous nerve entrapment syndrome (ACNES) is the most frequent cause of pain in these cases." When thinking about what I see in my clinic, I am not surprised at these numbers.
Other common cutaneous nerve entrapment syndromes involve various cutaneous nerves of the SKULL AND NECK. Take for instance the occipital nerves (those nerves at the back of the head). A study from the April 2016 issue of Headache (Occipital Neuralgia Diagnosis and Treatment: The Role of Ultrasound) had this to say. "Occipital neuralgia is a form of neuropathic type of pain in the distribution of occipital nerves. Occipital neuralgia frequently occurs as a result of nerve entrapment or irritation by a tight muscle or vascular structure, or nerve trauma during whiplash injury. Ultrasound not only allows distinguishing normal from abnormal entrapped occipital nerves, it can identify the level and the cause of entrapment as well." Which leads into the next topic concerning cutaneous nerve entrapments --- imaging.
After mentioning some of the things that can cause entrapment of cutaneous nerves (fibrous bands, scar tissue, fibrosis, masses, bony calluses, external compression, inflammation, and others), sports medicine physician, Phillip M. Steele, showed via his 64 page online seminar notes (Nerve Entrapments: Frequently Seen, Commonly Missed) exactly what's stated in the title; these problems are common. I'm going to go out on a limb here and say that cutaneous nerve entrapments are probably even more common than experts like Dr. Steele believe. Why? Because when you start talking about things like SCAR TISSUE / FIBROSIS as causes of cutaneous entrapment, all bets are off. Simply imagine how much easier it would be to bind a nerve in soft tissues that are deranged and TETHERED due to it looking / acting more like a HAIRBALL, than in healthy elastic tissue that looks more like well-combed hair under a microscope.
Which begs yet another question; what can be done to effectively deal with these entrapments? as ou probably already guessed, the peer-reviewed literature is definitely slanted towards invasive procedures such as INJECTIONS, NSAIDS, and various forms of tissue releases (surgery). While I would never argue against the fact that in some cases --- maybe even many cases --- drastic measures like these might be required; likewise, in many cases --- probably the majority of cases --- the problems could be dealt with conservatively using various MANIPULATIVE TECHNIQUES, MASSAGE, or TISSUE REMODELING (for examples, CLICK HERE). And as I've written concerning treating those who might already be "CENTRALIZED," what have you got to lose? Worst case scenario YOU TRY A TREATMENT and see what happens. It will either help or it won't; it's not going to somehow make you worse.
Be aware, however, that there are any number of societal issues at play that have undoubtedly led to a sharp spike in said nerve entrapments. Not surprisingly, INFLAMMATION has been mentioned as a causal factor many times in this post by people far smarter than I (inflammation always leads to fibrosis, which always leads to degeneration --- HERE). And with the vast majority of our adult population either OVERWEIGHT OR OBESE, this creates its own risk factors for cutaneous nerve entrapment simply because there is a SUBSTANTIAL LAYER OF FAT just under the skin (sub-cutaneous). Similarly, because so many Americans are both sedentary and HUNCHED OVER ALL DAY in the posture of chronic pain, chronic illness, and age; nerve entrapments occur easier as well (motion is lotion when it comes to the musculoskeletal and nervous systems).
All of this together is why an important part of almost anything I do involves educating patients or others who are willing to learn, about the things they can do to help them help themselves (HERE). Oh; and for those of you who love reading about fascia, check out my FASCIA SUPER POST with all 140 of my articles on fascia neatly organized and categorized.
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