Chiropractic is certainly one of the most popular therapeutic modalities encompassed by complementary and alternative medicine. In the well-known survey by Eisenberg et al,1 11% of respondents had used chiropractic in the preceding year. Visits to chiropractors account for most visits to practitioners who provide complementary and alternative medicine2 and represent the most common complementary and alternative medicine intervention employed by older adults.3 Chiropractors are now recognized as qualified practitioners by a growing number of health insurance companies4 and receive referrals from a considerable number of physicians practicing in other fields of expertise.5 Every state recognizes or requires examinations administered by the National Board of Chiropractic Examiners before licensing chiropractic professionals and defines continuing education criteria for license renewal.6,7 In the apt words used by Meeker and Haldeman,6 chiropractic is now "a profession at the crossroads of mainstream and alternative medicine."