Trigger Point Therapy for Myofascial Pain (2 page)

T
ENSOR
F
ASCIAE
L
ATAE

P
IRIFORMIS

H
AMSTRINGS

Q
UADRICEPS

A
DDUCTORS

P
ECTINEUS

G
RACILIS

S
ARTORIUS

P
OPLITEUS

G
ASTROCNEMIUS

S
OLEUS

T
IBIALIS
P
OSTERIOR

T
IBIALIS
A
NTERIOR

P
ERONEAL
M
USCLES

L
ONG
E
XTENSORS
OF
THE
T
OES

L
ONG
F
LEXORS
OF
THE
T
OES

APPENDIX 1
        M
ERIDIAN
P
ATHWAYS

APPENDIX 2
        O
N
C
UTANEOUS
Z
ONES

APPENDIX 3
        C
OMMONLY
U
SED
A
CUPOINTS

F
OOTNOTES

B
IBLIOGRAPHY

A
OUT THE
A
UTHORS

A
BOUT THE
I
NNER
T
RADITIONS

B
OOKS OF
R
ELATED
I
NTEREST

C
OPYRIGHT

INTRODUCTION

A G
ATHERING OF
F
ORCES

Toward an Era of Interdisciplinary Cooperation in the Treatment of Pain

T
he field of pain management, specifically the treatment of myofascial pain syndromes, has become a meeting ground for health professionals. Acupuncturists, medical doctors, and practitioners of various manual and physical therapies who previously had little to say to one another are now collaborating in ways that are unprecedented in the history of American health care. The reason for the development of such interdisciplinary communication is the growing recognition that myofascial syndromes are the basis of a huge segment of patient complaint, and associated allocation of resources, within our health care system.

Patients with myofascial pain syndromes are seeking the help of family physicians, internists, orthopedists, neurologists, rheumatologists, osteopaths, physiatrists, psychiatrists, and anesthesiologists. Dentists, particularly specialists in temporomandibular joint syndrome, regularly see patients presenting with myofascial pain. In addition, acupuncturists, chiropractors, physical therapists, occupational therapists, massage therapists, and psychotherapists are all encountering patients in pain. Conferences on pain treatment have increasingly become polyprofessional experiences.

It is possible that, through health professionals' mutual interest in the treatment of myofascial pain syndromes, true complementary medicine may emerge as a reality in the United States.
Complementary medicine
here refers to the use of conventional medical practices in conjunction with recently emerging Oriental and other body-therapy approaches, providing a coordinated treatment strategy that is best for the patient. This differs from the alternative medical model, which tends toward a competitive concept of health care, ultimately forcing a division between itself and conventional medical practices that may not, in the long run, be of the greatest benefit to patients. At this point in our medical history the fact is that health professionals from widely varying disciplines are talking to each other with a newfound respect, and the result may be the fostering of a cooperative spirit that will help millions of people who are in pain.

This book, a field manual for any health professional dealing with myofascial syndromes, therefore serves a vital purpose. Its aim is to simplify and order the vast amounts of information related to the evaluation and treatment of myofascial pain. Utilizing our many years of clinical and teaching experience, we have endeavored to address the concerns and desires of health care providers for a manual that can assist in evaluating a patient, defining the presenting condition, and guiding treatment of that condition. It is assumed that the reader has some knowledge of myology; therefore no effort is made to replicate the extensive background and theoretical discussion found in seminal works on myofascial pain, such as those of Janet Travell and David Simons and P. E. Baldry.
¹
Instead, in addition to the technical core of the manual, introductory chapters discuss topics that will facilitate communication among the many professions concerned with this area of study.

We begin with a discussion on the nature of muscles and trigger points, useful as review for those who treat primarily from this perspective and a good introduction for those entering the field. We then examine the phenomenology of qi, that elusive concept of “energy” that is the foundation of all Oriental medical practices. Qi is examined from the perspective of myofascial syndromes, making it a more accessible and useful metaphor for all health professionals. It is hoped that an expanded view of the concept of qi will help facilitate, rather than hinder, communication between practitioners of Eastern and Western medicine.

Since muscle-palpation skills are at the center of effective evaluation and treatment, we next discuss the nature and process of palpation. Because a relative few practitioners are adept in this type of palpation, some guiding principles are offered to help those who are evolving palpation skills. A chapter outlining the fundamental approaches to evaluation and treatment of myofascial pain syndromes helps establish common ground among health professionals, in the realization that there are behavioral elements in treatment that are shared, independent of one's particular training or orientation. Thus the acupuncturist, neurologist, and physical therapist, while differing in perspective regarding myofascial pain syndromes, all ultimately share similar behaviors in evaluation and treatment. A brief overview of how to use the clinical body of the manual, with a description of the information provided for each muscle, finishes the introduction.

In the final analysis, since this is a manual for the health professional who encounters patients presenting with pain on a daily basis, the approach is pragmatic and behavioral. In the interest of expanding our scientific knowledge, it is enticing to determine underlying mechanisms for pain that strengthen our theoretical understanding. However, it is far more important that the practitioner in the field ascertain what helps patients, and learns how to effect that help. This book is about how, not why.

CHAPTER 1

T
HE
N
ATURE OF
M
USCLES AND
T
RIGGER
P
OINTS

M
ovement is a fundamental characteristic of life, and the musculature plays the major role in that activity. Motion, both gross and subtle, is an essential body function resulting from the contraction and relaxation of muscles. In humans the musculature constitutes 40 to 50 percent of total body weight. Considered as a single entity, the musculature can be regarded as the body's largest internal organ.

There are three primary functions of the muscles. First, they contribute to the support of the body and containment of the internal organs. Second, they allow movement of the body as a whole, as well as movements of the organs and substructures. Many kinds of motion rely on the integrated functioning of bones, joints, tendons, ligaments, muscles, and fascia. Both the maintenance of our upright posture as well as all body movements—walking, sitting, writing, chewing, breathing, and so forth—take place as a result of appropriate muscular activity. Internal, organic movement that is the hallmark of life relies on appropriate muscular activity: the beating of the heart and the movement of blood throughout the arterial vessels; digestion, peristalsis, and elimination; the emptying of the bladder; the very ability to draw a breath. Finally, this movement produces heat and therefore contributes to the regulation of body temperature, the third primary function of the muscles.

The three types of muscle—skeletal muscle, visceral muscle, and cardiac muscle—provide these functions. Each of these tissues exhibits four principal characteristics:

1. Excitability (irritability)—the ability to receive and respond to stimuli via nerve impulse
   
2. Contractility—the ability to shorten when a sufficient internal or external stimulus is received
   
3. Extensibility—the ability to be stretched
   
4. Elasticity—the ability to return to normal shape after contraction or extension
   

The focus of this manual is the contractile, voluntary skeletal muscle tissue. There are two types of skeletal muscle: phasic muscles and postural, or tonic, muscles.

Phasic muscles produce a contraction known as a
phasic contraction.
A phasic contraction is sufficient for the muscle to produce movement of its attachments. Phasic muscles are mainly comprised of fast-twitch fibers, which tend to produce rapid contractions and therefore function to produce rapid movements. There is a generally low capillary supply to phasic muscles and, as a result, these muscles tend to fatigue quickly. Phasic muscles tend toward the rapid accumulation of lactic acid. When there is muscular dysfunction, phasic muscles tend toward weakening.

Those that are generally considered to be phasic muscles include the midthoracic portion of the erector spinae; the rhomboids; the lower and middle trapezius; the abdominal portion of pectoralis major; triceps brachii; vastus medialis and vastus lateralis; gluteus maximus, gluteus medius, and gluteus minimus; rectus abdominis; and the external and internal obliques.

Postural, or tonic, muscles produce a sustained partial contraction of the muscle known as a
tonic contraction.
With a tonic contraction a portion of the muscle cells in the muscle are contracted at any given time while others are relaxed. This causes some contraction of the muscle; however, because enough fibers are not contracted at the same moment in time, a tonic contraction does not produce movement of the skeletal attachments.

During a tonic contraction an individual motor unit does not function continuously; rather, individual motor units within the muscle fire asynchronously, thereby relieving one another in a smooth and continuous manner. The result is a muscle contraction that can be held for long periods of time. As the name implies, these postural, or tonic, muscles act in the maintenance of upright posture; they are considered to be “antigravity” muscles. Postural muscles tend to be comprised mainly of slow-twitch fibers. There is generally a high capillary supply to these muscles, and as a result they do not tend to fatigue rapidly. Lactic acid production is minimal. When there is muscular disturbance, postural muscles tend toward shortening.

Those that are generally considered to be postural muscles include the scalenes, sternocleidomastoid, levator scapulae, pectoralis major, biceps brachii, the cervical and lumbar portions of the erector spinae, quadratus lumborum, iliopsoas, the hamstring group (biceps femoris, semitendinosus, semimembranosus), rectus femoris, tensor fasciae latae, the adductor group (adductor magnus, longus, and brevis), pectineus, gracilis, piriformis, gastrocnemius, and soleus.

Skeletal muscles, both phasic and tonic, are extremely vulnerable to injury due to overuse and the wear and tear of daily life, yet this musculature is often overlooked as a major source of physical pain and dysfunction.

In order to clearly understand the nature of an injured muscle we must first understand the qualities of normal muscle. Normal, healthy muscle tissue feels supple and elastic. The underlying structures—bones, joints, and viscera—may be easily palpated through the skeletal muscle. There is uniform consistency and plasticity within a normal muscle, and it is not tender when palpated. A healthy muscle will contract in response to nervous impulse, returning to its normal shape after contraction. Individual bundles of muscle fibers (fascicles) cannot be differentiated while palpating normal muscle.