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Chiropractic is the most significant nonscientific health-care delivery system in the United States. As a result of their high level of organization and aggressiveness, chiropractors are licensed to practice in all 50 states and several foreign countries. Although a minority of chiropractors offer rational treatment, chiropractic's cultism is so well entrenched that the profession should be viewed as a societal problem, not simply as a competitor of regular health-care.
Spinal manipulation can be useful, but chiropractic's theoretical basis rests largely on a strange and never-demonstrated notion of "subluxations." "Chiropractic" literally means "done by hand" (chiros = hand; praktos practice), referring to manipulation of the spine. Manipulation (i.e., "the forceful, passive movement of a joint beyond its active limit of motion," according to Dorland's Illustrated Medical Dictionary) is not the exclusive domain of chiropractors. Folk practitioners sometimes called "bonesetters" have long used the notion of bones "going out of place" to explain maladies, and they employ manipulation as a panacea. Andrew Taylor Still invented "osteopathy" based upon the theory that luxated bones interfere with blood circulation, producing all manner of diseases. (Osteopathy officially abandoned Still's theory in 1948.)
Today, physiotherapists, athletic trainers, and several types of medical doctors sometimes employ manipulation for neuromusculoskeletal conditions. There is sufficient evidence that manipulation can at least temporarily improve the range of motion of impaired joints and relieve pain -- sometimes dramatically -- to make it a worthwhile, although limited, medical procedure. Manipulation requires a good deal of individual skill, which many chiropractors possess.
Chiropractic's uniqueness is not in its use of manipulation but in its theoretical basis for doing so -- which also explains why chiropractors overutilize spinal manipulation therapy (SMT), often applying it without justification.
Chiropractic is the brainchild of Daniel D. Palmer, a late-nineteenth century dabbler in metaphysical approaches to health care. Palmer had practiced phrenology and magnetic healing, and had some osteopathic training. He reported that a spiritualist medium inspired him in his search for "the single cause of all disease." He puzzled over the fact that pathogenic germs were found in both healthy and sick people and searched for an explanation. (Today, we know that the immune system makes the difference.) He claimed that in 1895 he restored the hearing of janitor Harvey Lillard and concluded that the spine was the key to health and disease.
Palmer contrived the notion that "subluxations" of the spine impinge nerves, interfering with nerve flow, which he dubbed the Innate Life Force, and that all a practitioner had to do was to adjust the spine -- the healing powers of nature would do the rest. Neither Palmer nor any other chiropractor has ever been able to reliably demonstrate the existence of "subluxations," much less validate their importance to health and disease. Nevertheless, chiropractic has thrived and now has about 60,000 practitioners in the United States.
When chiropractors are challenged to explain precisely what effect nerve impingement is supposed to have upon a nerve impulse (i.e., frequency of propagation, amplitude, etc.), they either fall back upon metaphysical notions of the Innate Life Force or evoke one of many common ploys:
They do this while continuing to practice as if subluxations were an established reality.
A comprehensive critique of chiropractic's lack of scientific validity was published by the College of Physicians and Surgeons of the Province of Quebec in 1963 and remains relevant today. It stated:
Chiropractors claim that subluxations, or partial displacements, of the vertebrae cause a perturbation of the distribution of nervous impulses to tissues and cells. Neurophysiologists have developed methods of recording the passage of impulses in nerves. Exceptionally sensitive apparatus is available to anyone wishing to use it. No scientific study has ever been published on the subject by a chiropractor. No chiropractor ever defined, either quantitatively or qualitatively, what chiropractic means by perturbation of nervous impulses. Is it their number, their amplitude, their frequency, or their wave patterns which are affected? All of these qualities can be identified, recorded, and studied. It is no longer permissible to accept empirical statements. Proof should have preceded practical application. With the first point untenable, the rest crumbles .
In 1973, Yale University anatomist Edmund Crelin, Ph.D., demonstrated that subluxations severe enough to impinge upon the nerves exiting through openings between the spinal bones were impossible to produce without total disablement . He subsequently observed that instead of the scientific response of attempting to reproduce his research, the ACA simply declared that his work was invalid because it was done on cadavers . In fact, Crelin states, the absence of a reflex response in a dead body should make subluxations easier to produce. Faced with this evidence, a true-believing chiropractor once remarked to me that the reason Crelin had failed to demonstrate the chiropractic hypothesis was that he worked with cadavers in which Innate Life Force was no longer present!
An excuse chiropractors employed for years for the lack of scientific evidence for their theory was that the government wouldn't provide the necessary research funding. The falsity of this claim was exposed in 1972, when the International Chiropractic Association reported that the federal government had approved a grant for Chung Ha Suh, Ph.D., at the University of Colorado, to develop a method for measuring spinal configurations to determine the existence of chiropractic subluxations and that the grant application was the first in chiropractic's history .
Scott Haldeman, D.C., M.Sc., Ph.D., M.D., a third-generation chiropractor whose personal commitment to validating chiropractic led him to obtain a medical degree and advanced degrees in neurophysiology, has criticized the attempts of Suh and others "to find more accurate ways of measuring a subluxation in the absence of any solid data that the subluxation is worth measuring."  Although providing chiropractic public relations personnel with fodder for a decade, Suh's work on the illusive subluxation never got anywhere and now seems fruitless at best.
Apologists have some room for defensive debate because of the difficulty of establishing mechanisms of cause and effect in many other fields of science. An easier and more practical test of chiropractic is that of the reliability (i.e., consistency) of chiropractors' clinical ability to identify subluxations. They have not fared well in these tests.
Investigative reporter Ralph Lee Smith visited the Palmer Clinic in Davenport, Iowa, and the National College Clinic at Lombard, Illinois, on two successive days. At Palmer he was told that he had subluxations at the ninth dorsal and the fifth lumbar; at National a subluxation was diagnosed at the fifth dorsal only. Neither found other subluxations alleged by another chiropractor seen earlier .
In 1973, Stephen Barrett, M.D., sent a healthy four-year-old girl to five chiropractors for a"'check up.'"The first said the child's shoulder blades were "out of place" and found "pinched nerves to her stomach and gall bladder." The second said the child's pelvis was "twisted." The third said one hip was "elevated" and that spinal misalignments could cause "headaches, nervousness, equilibrium or digestive problems" in the future. The fourth predicted "bad periods and rough childbirth" if her "shorter left leg" were not treated. The fifth not only found hip and neck problems, but also "adjusted" them without bothering to ask permission. Several years later, 11 chiropractors who examined two adult women had similarly inconsistent findings .
Mark L. Brown, a reporter for the Quad City Times, serving the Davenport, Iowa, area, conducted his own five-month investigation of the practice of chiropractic. He produced an insightful 36-page Sunday newspaper supplement revealing some bizarre as well as some useful practices. Brown also found numerous inconsistencies, including diagnoses that his left leg was shorter than his right leg and vice versa! 
Chiropractors commonly blame others for their lack of science, claiming to have been isolated by organized medicine. In reality, chiropractic's isolation is self-imposed. Chiropractors substitute chiropractic philosophy for science and commonly boast of intellectual superiority. True-believers say that someday the world will acknowledge the greatness of chiropractic. It would be impossible for chiropractors who adhere to chiropractic theory and philosophy to work with scientific healthcare providers. Chiropractors' concepts of the causes and treatments of disease differ radically; and, although health scientists worldwide can bridge barriers of language and culture via the common ground of basic science, they cannot work with pseudoscientists.
There is considerable concern about the wisdom of permitting chiropractors to serve as entry-level health-care providers. Practitioners devoted to a pseudoscientific approach to disease are apt to miss serious diseases when hearing patient complaints. Reformist chiropractor Peter Modde concluded that malpractice is an inevitable result of chiropractic training and philosophy  .
How widely the subluxation theory is believed among chiropractors is uncertain. In a 1981 report, 88% of 268 responding chiropractors gave subluxations in musculoskeletal problems an importance of 70 % or more, and 60% of 265 respondents gave subluxations in visceral disorders a rating of 70% or more . A similar survey conducted today would probably show smaller but still substantial percentages. The proportion of chiropractors who believe in the metaphysical Innate Life Force is unknown.
Chiropractic has become a conglomeration of factions in conflict, bound together only by opposition to outside critics. At least a dozen different notions about how the spine should be corrected divide practitioners. Some say only the Atlas needs adjusting; others go to the other end of the spine and say only the sacral area is important. Still others use both ends (sacrooccipital). Several adhere to specific vertebral levels for specific organs or diseases. Some measure leg lengths or test muscles -- called "applied kinesiology" (AK) -- for weakness or strength in association with foods, colors, music, and just about anything else. (Even AK's originator expressed skepticism about the technique being used to determine one's personal star.)
The most obvious rift among chiropractors is between "straights" and "mixers." Straights adhere more to chiropractic's original theory and practice, while "mixers" (a term applied by the straights and unpopular among the mixers) may incorporate almost any modality into their practices. The ICA is the straights' national organization, and the ACA represents mixers.
The confusion within chiropractic over subluxations, scope of practice, and other important health-care issues was described by the U.S. Department of Health and Human Services' Office of Inspector General (OIG). Its 1986 report stated:
Heated controversy regarding chiropractic theory and practice continues to exist. . . . On-site and telephone discussions with chiropractors and their schools and associations, coupled with a review of background materials ... result in a picture of a profession in transition and containing a number of contradictions.... There continues to be some disagreement within the profession regarding which conditions are appropriate for chiropractic care and regarding appropriate parameters for treatment .
The OIG investigators also made note of "the problem side of chiropractic." The report states:
Despite the evidence which was presented during the study regarding the increased emphasis on science and professionalism ... there also exist patterns of activity and practice which at best appear as overly aggressive marketing and, in some cases, seem deliberately aimed at misleading patients and the public regarding the efficacy of chiropractic care .
There are also chiropractors who practice rational, conservative spinal manipulative therapy for neuromusculoskeletal disorders. They do not claim to be alternative practitioners but offer their skills as manipulation therapists when such treatment is medically justifiable. What proportion of chiropractors fit this description is unknown. The National Association of Chiropractic Medicine (NACM) was formed in 1984 as an attempt to organize reform-minded chiropractors. There may be a substantial number of rational chiropractors "in the closet," in which case our view of chiropractic may be distorted by the hucksters and zealots among the guild.
Because of the great diversity among chiropractors, it is impossible to evaluate individual practitioners according to the commonly advanced straights/mixer dichotomy. There is a common misconception that straights are old-fashioned (i.e., unscientific) and mixers are modern (i.e., scientific). Although straights may be labeled "cultists" for adhering to Palmer's dogma, the additional modalities mixers employ are apt to be just as nonscientific. Mixers utilize colonics, iridology, unproven devices, applied kinesiology (muscle-testing), megavitamins, herbology, crystals, variations of acupuncture, glandular therapy, craniopathy, and a seemingly endless array of dubious diagnostic, prescription, and therapy procedures.
Of course those who use questionable methods can be rejected as untrustworthy on that basis alone, but because chiropractors are very philosophical, individuals can be challenged on the basis of why they manipulate. True-believer chiropractors would be loath to admit that their ministrations are so mundane as to deal with effects rather than basic causes. This topples them from their imagined dominance as "the true physicians" to merely therapists. Rational chiropractors will readily admit that SMT relieves effects not causes. The fact that they mainly provide temporary somatic relief, rather than dealing with the causal factors of disorders, is evidenced by the large amount of repeat business they generate. Too-frequent treating is a factor noted by nearly every commission that has evaluated chiropractic. Third-party payers commonly control chiropractic costs by limiting the number of treatments or the annual amount for which devotees may receive reimbursement.
Individual chiropractors can also be judged according to their opposition or endorsement of scientifically established public-health practices, such as fluoridation, immunization, pasteurization, and modern food technology. Chiropractors are often in the forefront of antiscientific social movements opposing such practices.
Despite its appalling lack of science, chiropractic has a loyal following of clients. I believe this can be credited to the somatic relief of SMT and the psychological aspects of chiropractic care. SMT involves the laying on of hands, which reportedly has the effect of relaxing the patient. The laying on of hands also is said to increase suggestibility, which enhances the placebo effects of SMT. Reformist Samuel Homola, D.C. has stated:
The majority of the "subluxations" commonly found by many chiropractors are likely to be painless and imaginary. In replacing these imaginary subluxations, the practitioner places his hands upon the patient's back and applies a sudden thrust, causing the bones to come together, making a noise like the "crushing of an old basket." This thrust, with "popping" of the vertebrae, has a tremendous psychological influence over the mind of the healthy patient as well as over the mind of the sick patient. While the popping sound itself is quite meaningless . . . (such as "cracking" the knuckles) . . . this influence might be used to advantage in curing psychosomatic conditions-provided the patient is informed that the bone is "back-in-place" and will stay there. By the same token, however, such treatment used on the mentally unstable and nervous person can cause a great deal of harm; that is, by perpetuating a psychosomatic condition or even creating a new psychological illness .
Thus Homola points out that the placebo effect is not without potential for harm. By experiencing relief, the patient is taught illness through operant conditioning. In addition to the direct physical effects Homola describes, chiropractors engage in a great deal of verbal conditioning. Manipulation itself can feel good (although it can also be painful) and can be addictive, according to chiropractic reformist Charles DuVall, D.C. .
Chiropractors have been shown to be better at satisfying patients than medical doctors are. This is because they validate patients' problems medical doctors tend to minimize, offer simplistic explanations about health and disease, and work at being friendly. Chiropractic also offers both a mechanistic and a metaphysical explanation for its effects, appealing to both needs. Chiropractic rhetoric has adapted itself to contemporary flavors of "holistic" health-care. In fact, chiropractic is not holistic but spine-centered, but this seems to escape notice.
Success promoters who give seminars to train chiropractors in psychological patient manipulation are a notorious problem within chiropractic. I study a wide variety of health pseudosciences, but I know of no other guild that has formalized the education of practitioners in patient deception. While many of the procedures taught are simply good office practice, many others are fraudulent .
Former ACA public-relations consultant Eric Baizer says the ACA conducts an aggressive public-relations program aimed at selling chiropractors as family doctors and primary-care providers. Baizer describes how as a PR expert he defended chiropractic publicly by responding to negative press reports. He says he employed stock answers and reusable clichés -- what one writer termed "factoids" (i.e., statements designed to resemble facts). "For example," Baizer wrote, "if someone attacked the quality of chiropractic education, we would point out that chiropractors attended colleges accredited by an agency recognized by the U.S. Office of Education-implying that the schools must be of high quality. How good is the chiropractic curriculum? How qualified are the instructors? Are inspections of the colleges thorough? These are the kinds of issues best left unexplored." 
The illusionary "subluxation" not only is the theoretical basis for chiropractic but constitutes its legal basis as well. Many state laws describe chiropractic as the finding and removal of subluxations. It is enigmatic that such a system thrives late in the twentieth century, which has seen such progress in the biological sciences and health care. While biological scientists have unraveled the genetic double-helix, chiropractors have failed to scientifically define their theory or scope of practice, or to justify their very existence as primary health-care providers.
Chiropractic's survival and success is undoubtedly due to the reality that healthcare delivery involves much more than science. Politics, business considerations, and the clinical art often take precedence. Although it is the scientific validity of the methods employed that justifies modern health-care, in practical terms of survival in the marketplace, chiropractic demonstrates daily that the scientific aspects of health care are of least importance and in greatest need of protection.
The chiropractic guild is adept at having its way with politicians. This appears to be primarily due to its applications of business law to the health marketplace. Chiropractors pose themselves as competitors of "allopathic medicine" (a misnomer, since allopathic medicine, which employed bleeding, purging, and so forth, to balance the four Greek humors, was replaced long ago with the emergence of medical science). Unfortunately, standard medicine is regarded by many legislators as simply holding another opinion among differing viewpoints. Chiropractors encourage the concept that they are a separate but equal healthcare delivery system. They find allies among those who present science as merely "Western thought" and find the Innate Life Force notion compatible with Eastern metaphysical world-views.
Politicians seem to have trouble differentiating between religious beliefs and beliefs in various forms of health care. Chiropractic's clientele is loyal, and its political clout is greater than that of its critics. Patients willingly cooperate with chiropractors when asked to send letters to lawmakers. Many subscribe to the myth of a vindictive medical profession out to crush its opposition.
In the final analysis, the validity of chiropractic is not a medical controversy as much as one of the basic biological sciences. Medicare reimburses chiropractors with millions of taxpayers' dollars each year for removing "subluxations" allegedly demonstrated by X-rays. Basic biological scientists have a public duty to objectively test a theory as radical as chiropractic's to determine whether it is valid. The failure to require scientific validation of an entire healthcare delivery system provides a disturbing precedent for other nonscientific systems to lay claim to the public purse. Chiropractic and other nonscientific forms of health care will survive until the public demands that scientific justification become a primary qualification for legalization and reimbursement.
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This article was revised on April 28, 2000.