|Reprinted from The
RSI Network - Issue 40 - August'99
Hal Blatman, MD
During the last few years I have followed the postings to online Repetitive Strain Injury (RSI) discussion lists with considerable interest, and have occasionally offered some suggestions for myofascial pain sufferers. Scott Wright encouraged me to write this FAQ to assist in understanding myofascial pain, a syndrome that is still quite a mystery to many people including physicians, chiropractors, and therapists.
When muscles are overused, fatigued, and strained, trigger points form in the muscle and its associated fascia. Fascia is the variable thickness connective tissue that holds muscle fibers together, attaches muscles to bone, and holds bones together. These trigger points can be felt as small knots within taught and ropy bands of muscle. The trigger point causes the tightness along the muscle fibers, thereby forming the taught or ropy band.
Each trigger point generates two pain patterns, whether the person is conscious of it or not. One pain pattern is localized, causing local soreness and tenderness, while the other may be local or distant. The distant or referred pain pattern will be interpreted by the brain as numbness, tingling, burning or aching. All trigger points may generate some degree of these pain patterns all of the time. Trigger points may also cause the muscle to cramp.
Trigger points may be classified as active, latent, or satellite.
Repetitive strain injury causes formation of new trigger points and activation of latent trigger points within the injured muscles. Sustained contraction of muscle to maintain a position (sustained, posture) will also activate trigger points.
During medical and other therapy training programs, we are taught that repetitive strain injury causes inflammation of the overused tissues. This can indeed occur. In the extreme circumstance, there can be physical evidence of an inflammatory conditioncalled crepitus. Crepitus is the "creaking" that occurs as not-so-well-lubricated tendons fail to glide smoothly. It can sometimes be felt in the swollen and injured tissues. This inflammation can be very serious.
Unfortunately treatment professionals are usually only aware of the "inflammation model" or theory for the cause and treatment of pain due to repetitive strain. In addition, the makers of non-steroidal anti-inflammatory drugs (NSAIDs) continue to educate the public about inflammation in order to promote products like Naprosyn ("just Nupe it"), and Motrin. Unfortunately, these drugs can be dangerous: there were a reported 100,000 hospitalizations and 15,000 deaths last year in the USA alone, due to side effects of NSAIDs.
Most of the time, however, the primary pathology resulting from repetitive strain injury is not inflammation, but rather it is myofascial pain generated primarily from trigger points in the injured muscles. Later, satellite and latent trigger points also contribute to the pain pattern.
Therefore, treatment of the myofascial component of the condition will generally result in greater therapeutic success. The treatment for myofascial pain is to first minimize the perpetuating factors. These are things which can perpetuate or worsen the pain condition. The categories that may require change include:
Then the trigger points need to be made smaller. This is done mostly by physical techniques. These include:
Mental work such as relaxation therapy and biofeedback may also be important.
I hope this information is useful. The most complete source for information is the two volume medical text by Travell and Simons: Myofascial Pain and Dysfunction, The Trigger Point Manual, available through your local medical library or bookstore. (It is available through Amazon.com, $189.00)
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Last Updated: 11/03/00