J Manipulative Physiol Ther. 2011 (Jun); 34 (5): 274289 ~ FULL TEXT
Roland Bryans, DC, Martin Descarreaux, DC, PhD, Mireille Duranleau, DC,
Henri Marcoux, DC, Brock Potter, DC, Rick Ruegg, PhD, DC, Lynn Shaw, PhD,
Robert Watkin, LLB, Eleanor White, DC
Guidelines Development Committee Chair and Chiropractor,
Clarenville, Newfoundland and Labrador, Canada.
OBJECTIVE: The purpose of this manuscript is to provide evidence-informed practice recommendations for the chiropractic treatment of headache in adults.
METHODS: Systematic literature searches of controlled clinical trials published through August 2009 relevant to chiropractic practice were conducted using the databases MEDLINE; EMBASE; Allied and Complementary Medicine; the Cumulative Index to Nursing and Allied Health Literature; Manual, Alternative, and Natural Therapy Index System; Alt HealthWatch; Index to Chiropractic Literature; and the Cochrane Library. The number, quality, and consistency of findings were considered to assign an overall strength of evidence (strong, moderate, limited, or conflicting) and to formulate practice recommendations.
RESULTS: Twenty-one articles met inclusion criteria and were used to develop recommendations. Evidence did not exceed a moderate level. For migraine, spinal manipulation and multimodal multidisciplinary interventions including massage are recommended for management of patients with episodic or chronic migraine. For tension-type headache, spinal manipulation cannot be recommended for the management of episodic tension-type headache. A recommendation cannot be made for or against the use of spinal manipulation for patients with chronic tension-type headache. Low-load craniocervical mobilization may be beneficial for longer term management of patients with episodic or chronic tension-type headaches. For cervicogenic headache, spinal manipulation is recommended. Joint mobilization or deep neck flexor exercises may improve symptoms. There is no consistently additive benefit of combining joint mobilization and deep neck flexor exercises for patients with cervicogenic headache. Adverse events were not addressed in most clinical trials; and if they were, there were none or they were minor.
CONCLUSIONS: Evidence suggests that chiropractic care, including spinal manipulation, improves migraine and cervicogenic headaches. The type, frequency, dosage, and duration of treatment(s) should be based on guideline recommendations, clinical experience, and findings. Evidence for the use of spinal manipulation as an isolated intervention for patients with tension-type headache remains equivocal.
Key Indexing Terms: Spinal Manipulation, Migraine Disorders, Tension-Type Headache, Post-traumatic Headache, Practice Guideline, Chiropractic
From the FULL TEXT Article:
Headache is a common experience in adults. Recurring headaches negatively impact family life, social activity, and work capacity. [1, 2] Worldwide, according to the World Health Organization, migraine alone is 19th among all causes of years lived with disability. Headache is third among reasons for seeking chiropractic care in North America. 
Accurate diagnosis is key to management and treatment, and a wide range of headache types are described in the International Classification of Headache Disorders 2 (International Headache Society [IHS]).  The categories are intended for clinical as well as research use. The most common headaches, tension-type and migraine, are considered primary headaches that are episodic or chronic in nature. Episodic migraine or tension-type headaches occur fewer than 15 days per month, whereas chronic headaches occur more than 15 days per month for at least 3 (migraine) or 6 months (tension-type headache).  Secondary headaches are attributed to underlying clinical problems in the head or neck that may also be episodic or chronic. Cervicogenic headaches are secondary headaches commonly treated by chiropractors and involve pain referred from a source in the neck and perceived in 1 or more regions of the head. The IHS recognizes cervicogenic headache as a distinct disorder,  and evidence that headache can be attributed to a neck disorder or lesion based on history and clinical features (history of neck trauma, mechanical exacerbation of pain, reduced cervical range of motion, and focal neck tenderness, excluding myofascial pain alone) is relevant to diagnosis but is not without controversy in the literature. [4, 5] When myofascial pain alone is the cause, the patient should be managed as having tension-type headaches. 
Treatment modalities typically used by chiropractors to care for patients with headaches include spinal manipulation, mobilization, device-assisted spinal manipulation, education about modifiable lifestyle factors, physical therapy modalities, heat/ice, massage, advanced soft tissue therapies such as trigger point therapy, and strengthening and stretching exercises. There is a growing expectation for health professions, including chiropractic, to adopt and use research-based knowledge, taking sufficient account of the quality of available research evidence to inform clinical practice. As a result, the purpose of the Canadian Chiropractic Association (CCA) and the Canadian Federation of Chiropractic Regulatory and Educational Accrediting Boards (Federation) Clinical Practice Guidelines Project is to develop guidelines for practice based on available evidence. The purpose of this manuscript is to provide evidence-informed practice recommendations for the chiropractic treatment of headache in adults.
The Guidelines Development Committee (GDC) planned for and adapted systematic processes for literature searching, screening, review, analysis, and interpretation. Methods are consistent with criteria proposed by the Appraisal of Guidelines Research and Evaluation collaboration (http://www.agreecollaboration.org). This guideline is a supportive tool for practitioners. It is not intended as a standard of care. The guideline links available published evidence to clinical practice and is only 1 component of an evidence-informed approach to patient care.
Data Sources and Searches
Systematic search and evaluation of the treatment literature were conducted using methods recommended by The Cochrane Collaboration Back Review Group6 and Oxman and Guyatt.7 The search strategy was developed in MEDLINE by exploring MeSH terms related to chiropractic and specific interventions and later modified for other databases. The literature search strategy was intentionally broad. Chiropractic treatment was defined as including the most common therapies used by practitioners and was not restricted to treatment modalities delivered only by chiropractors. A wide net was cast to include treatments that may be administered in chiropractic care as well as those that could also be delivered in the context of care by other health care professionals in a specific research study (Appendix A). Spinal manipulation was defined as a high-velocity low-amplitude thrust delivered to the spine. Excluded therapies included invasive analgesic or neurostimulation procedures, pharmacotherapy, injections of botulinum toxin, cognitive or behavioral therapies, and acupuncture.
Literature searches were completed from April to May 2006, updated in 2007 (phase 1), and updated again in August 2009 (phase 2). Databases searched included MEDLINE; EMBASE; Allied and Complementary Medicine; the Cumulative Index to Nursing and Allied Health Literature; Manual, Alternative, and Natural Therapy Index System; Alt HealthWatch; Index to Chiropractic Literature; and the Cochrane Library (Appendix A). Searches included articles published in English or with English abstracts. The search strategy was limited to adults
(≥18 years); although research studies with subject inclusion criteria encompassing a broad range of ages, such as adults and adolescents, were retrieved using the search strategy. Reference lists provided in systematic reviews (SRs) were also reviewed by the GDC to minimize relevant articles from being missed.
Evidence Selection Criteria
Search results were screened electronically, and multistage screening was applied (Appendix B): stage 1A (title), 1B (abstract); stage 2A (full text), 2B (full text-methodology, relevance); and stage 3 (full text-final GDC screening as clinical content experts). Duplicate citations were removed, and relevant articles were retrieved as electronic and/or hard copies for detailed analysis. Different assessors, using the same criteria, completed the literature screens in 2007 and 2009 due to the time span between searches.
Only controlled clinical trials (CCTs); randomized, controlled trials (RCTs); and systematic reviews (SRs) were selected as the evidence base for this guideline consistent with current standards for interpreting clinical findings. The GDC did not rate observational studies, case series, or case reports because of their uncontrolled nature and probable low methodological quality vs CCTs. This approach is consistent with updated methods for SRs published by the Cochrane Back Review Group.  If multiple SRs were published by the same authors on a given topic, only the most recent publication was counted and used for evidence synthesis. Systematic reviews of SRs were also excluded to avoid double counting of research results.
Literature Assessment and Interpretation
Quality ratings of CCTs or RCTs included 11 criteria answered by yes (score 1) or no (score 0)/do not know (score 0) (Table 1). The GDC documented 2 additional criteria of interest: (1) researchers' use of IHS diagnostic criteria for subject enrollment and (2) evaluation of side effects (Table 1, columns L and M). Use of IHS criteria  was relevant to this Clinical Practice Guideline (CPG) process to confirm diagnostic specificity within and across research studies. Studies were excluded if IHS diagnostic criteria were not applied by the researchers for subject inclusion into a study (Appendix C); and if before 2004, before cervicogenic headache was included in the IHS classification, the diagnostic criteria of the Cervicogenic Headache International Study Group  were not used. Side effects were reviewed as a proxy for potential risk(s) with treatment. No weighting factor(s) was applied to individual criteria, and possible quality ratings ranged from 0 to 11. Both blinding of subjects and care providers were rated in the research articles by the GDC, since these items are listed in the quality rating tool.6 The GDC's methods did not adapt or alter the rating tool. The rationale for this approach was that certain treatment modalities (eg, transcutaneous electrical nerve stimulation [TENS], ultrasound) and trial designs may achieve patient and/or practitioner blinding.  The GDC did not limit the evaluation of these benchmarks of quality if indeed they were reported in clinical studies for the treatment of headache disorders. The GDC also considered it outside their scope of expertise to modify, without validation, a widely used rating tool used to assess the clinical literature.  New research tools for the analysis and rating of the manual therapy literature, however, are urgently needed and are noted as an area for future research in the discussion section below.
Literature assessors were project contributors separate from the GDC and were unblinded as to study authors, institutions, and source journals. Three members of the GDC (MD, RR, and LS) corroborated quality rating methods by completing quality assessments on a random subset of 10 articles.  A high level of agreement was confirmed across quality ratings. Complete agreement on all items was achieved for 5 studies: in 10 of 11 items for 4 studies and 8 of 11 items for the 1 remaining study. All discrepancies were easily resolved through discussion and consensus by the GDC (Table 1). Due to heterogeneity of research methods across trials, no meta-analysis or statistical pooling of trial results was done. Trials scoring more than half of the total possible rating (ie, ≥6) were considered high quality. Trials scoring 0 through 5 were considered low quality. Studies with major methodological flaws or investigating specialized treatment techniques were excluded (eg, treatment not considered relevant by the GDC for the chiropractic care of patients with headache; Appendix Table 3).
Quality rating of SRs included 9 criteria answered by yes (score 1) or no (score 0)/do not know (score 0) and a qualitative response for item J no flaws, minor flaws, or major flaws (Table 2). Possible ratings ranged from 0 to 9. The determination of overall scientific quality of SRs with major flaws, minor flaws, or no flaws, as listed in column J (Table 2), was based on the literature raters' answers to the previous 9 items. The following parameters were used to derive the overall scientific quality of a SR: if the no/do not know response was used, an SR was likely to have minor flaws at best. However, if No was used on items B, D, F, or H, the review was likely to have major flaws.  Systematic reviews scoring more than half of the total possible rating (ie, ≥5) with no or minor flaws were rated as high quality. Systematic reviews scoring 4 or less and/or with major flaws were excluded.
Reviews were defined as systematic if they included an explicit and repeatable method for searching and analyzing the literature and if inclusion and exclusion criteria for studies were described. Methods, inclusion criteria, methods for rating study quality, characteristics of included studies, methods for synthesizing data, and results were evaluated. Raters achieved complete agreement for all rating items for 7 SRs  and for 7 of 9 items for the 2 additional SRs. [29, 30] The discrepancies were deemed minor and easily resolved through GDC review and consensus (Table 2).
Developing Recommendations for Practice
The GDC interpreted the evidence relevant to chiropractic treatment of headache patients. A detailed summary of the relevant articles will be posted to the CCA/Federation Clinical Practice Guidelines Project web site.
Randomized, controlled trials and their findings were appraised to inform treatment recommendations. To assign an overall strength of evidence (strong, moderate, limited, conflicting, or no evidence),  the GDC considered the number, quality, and consistency of research results (Table 3). Strong evidence was considered only when multiple high-quality RCTs corroborated the findings of other researchers in other settings. Only high-quality SRs were appraised in relation to the body of evidence and to inform treatment recommendations. The GDC considered treatment modalities to have proven benefit(s) when supported by a minimum of moderate level of evidence. Recommendations for practice were developed in collaborative working group meetings.
From the literature searches, initially 6,206 citations were identified. Twenty-one articles met final criteria for inclusion and were considered in developing practice recommendations (16 CCTs/RCTs [1120, 3136] and 5 SRs ). Quality ratings of the included articles are provided in Table 1, Table 2. Appendix Table 3 lists articles excluded in final screening by the GDC and reason(s) for their exclusion. Absence of subject and practitioner blinding and unsatisfactory descriptions of cointerventions were commonly identified methodological limitations of the controlled trials. Headache types evaluated in these trials included migraine (Table 4), tension-type headache (Table 5), and cervicogenic headache (Table 6). Consequently, only these headache types are represented by the evidence and practice recommendations in this CPG. Evidence summaries of SRs are provided in Table 7.
Treatment of Migraine
Spinal manipulation is recommended for the management of patients with episodic or chronic migraine with or without aura. This recommendation is based on studies that used a treatment frequency 1 to 2 times per week for 8 weeks (evidence level, moderate). One high-quality RCT,  1 low-quality RCT,  and 1 high-quality SR  support the use of spinal manipulation for patients with episodic or chronic migraine (Table 4, Table 7).
Weekly massage therapy is recommended for reducing episodic migraine frequency and for improving affective symptoms potentially linked to headache pain (evidence level, moderate). One high-quality RCT16 supports this practice recommendation (Table 4). Researchers used a 45minute massage with focus on neuromuscular and trigger point framework of the back, shoulder, neck, and head.
Multimodal multidisciplinary care (exercise, relaxation, stress and nutritional counseling, massage therapy) is recommended for the management of patients with episodic or chronic migraine. Refer as appropriate (evidence level, moderate). One high-quality RCT32 supports the effectiveness of multimodal multidisciplinary intervention for migraine (Table 4). The intervention prioritizes a general management approach consisting of exercise, education, lifestyle change, and self-management.
There are insufficient clinical data to recommend for or against the use of exercise alone or exercise combined with multimodal physical therapies for the management of patients with episodic or chronic migraine (aerobic exercise, cervical range of motion [cROM], or whole body stretching). Three low-quality CCTs [13, 33, 34] contribute to this conclusion (Table 4).
Low-load craniocervical mobilization (eg, Thera-Band, Resistive Exercise Systems; Hygenic Corporation, Akron, OH) is recommended for longer term (eg, 6 months) management of patients with episodic or chronic tension-type headaches (evidence level, moderate). One high-quality RCT  showed that low-load mobilization significantly reduced symptoms of tension-type headaches for patients during the longer term (Table 5).
Spinal manipulation cannot be recommended for the management of patients with episodic tension-type headache (evidence level, moderate). There is moderate-level evidence that spinal manipulation after premanipulative soft tissue therapy provides no additional benefit for patients with tension-type headaches. One high-quality RCT12 (Table 5) and observations reported in 4 SRs  (Table 7) suggest no benefit of spinal manipulation for patients with episodic tension-type headaches.
A recommendation cannot be made for or against the use of spinal manipulation (2 times per week for 6 weeks) for patients with chronic tension-type headache. Authors of 1 RCT  rated as high quality by the quality assessment too  (Table 1), and summaries of this study in 2 SRs [24, 26] suggest that spinal manipulation may be effective for chronic tension-type headache. However, the GDC considers the RCT  difficult to interpret and inconclusive (Table 5). The trial is inadequately controlled with imbalances in the number of subject-clinician encounters between study groups (eg, 12 visits for subjects in the soft tissue therapy plus spinal manipulation group vs 2 visits for subjects in the amitriptyline group). There is no way of knowing whether a comparable level of personal attention for subjects in the amitriptyline group may have impacted the study outcomes. These considerations and interpretations from 2 other SRs [25, 27]contribute to this conclusion (Table 7).
There is insufficient evidence to recommend for or against the use of manual traction, connective tissue manipulation, Cyriax's mobilization, or exercise/physical training for patients with episodic or chronic tension-type headache. Three low-quality inconclusive studies [19, 31, 35] (Table 5), 1 low-quality negative RCT,  and 1 SR  contribute to this conclusion (Table 7).
Spinal manipulation is recommended for the management of patients with cervicogenic headache. This recommendation is based on 1 study that used a treatment frequency of 2 times per week for 3 weeks (evidence level, moderate). In a high-quality RCT, Nilsson et al  (Table 6) showed a significantly positive effect of high-velocity, low-amplitude spinal manipulation for patients with cervicogenic headache. Evidence synthesis from 2 SRs [24, 29] (Table 7) supports this practice recommendation.
Joint mobilization is recommended for the management of patients with cervicogenic headache (evidence level, moderate). Jull et al  examined the effects of Maitland joint mobilization 8 to 12 treatments for 6 weeks in a high-quality RCT (Table 6). Mobilization followed typical clinical practice, in which the choice of low-velocity and high-velocity techniques was based on initial and progressive assessments of patients' cervical joint dysfunction. Beneficial effects were reported for headache frequency, intensity, as well as neck pain and disability. Evidence synthesis from 2 SRs [24, 29] (Table 7) supports this practice recommendation.
Deep neck flexor exercises are recommended for the management of patients with cervicogenic headache (evidence level, moderate). This recommendation is based on a study of 2 times daily for 6 weeks. There is no consistently additive benefit of combining deep neck flexor exercises and joint mobilization for cervicogenic headache. One high-quality RCT  (Table 6) and observations provided in 2 SRs [24, 29] (Table 7) support this practice recommendation.
Practitioners select treatment modalities in conjunction with all available clinical information for a given patient. Of the 16 CCTs/RCTS [1120, 3136] included in the body of evidence for this CPG, only 6 studies [11, 12, 15, 20, 32, 36] adequately assessed or discussed patient side effects or safety parameters (Table 1, column M). Overall, reported risks were low. Three of the trials reported safety information for spinal manipulation. [11, 12, 20] Boline et al11 reported that 4.3% of subjects experienced neck stiffness after initial spinal manipulation that disappeared for all cases after the first 2 weeks of treatment. Soreness or increase in headaches after spinal manipulation (n = 2) were reasons for treatment discontinuation cited by Tuchin et al.20 No side effects were experienced by any subjects studied by Bove et al  using spinal manipulation for the treatment of episodic tension-type headache. Treatment trials to evaluate efficacy outcomes may not enroll adequate numbers of subjects to assess the incidence of rare adverse events. Other research methods are required to develop a full understanding of the balance between benefits and risks.
Spinal manipulation and other manual therapies commonly used in chiropractic have been studied in several CCTs that are heterogeneous in subject enrollment, design, and overall quality. Patient and headache types systematically represented in the evidence base are migraine, tension-type headaches, and cervicogenic headache. The primary health status outcomes reported are typically headache frequency, intensity, duration, and quality-of-life measures. The evidence is no greater than a moderate level at this time.
The evidence supports the use of spinal manipulation for the chiropractic management of patients with migraine or cervicogenic headaches but not tension-type headaches. For migraine, multidisciplinary care using weekly 45minute massage therapy and multimodal care (exercise, relaxation, and stress and nutritional counseling) may also be effective. Alternatively, joint mobilization or deep neck flexor exercises are recommended for improving symptoms of cervicogenic headache. There appears to be no consistently additive benefit of combining joint mobilization and deep neck flexor exercises for patients with cervicogenic headache. Moderate evidence support the use of low-load craniocervical mobilization for longer term management of tension-type headaches.
Shortcomings for this guideline include the quantity and quality of supporting evidence found during the searches. No recent adequately controlled high-quality research studies with reproducible clinical findings have been published for the chiropractic care of headache patients. Studies are needed to further our understanding of specific manual therapies in isolation or in well-controlled combinations for the treatment of migraine, tension-type headache, cervicogenic headache, or other headache types presenting to clinicians (eg, cluster, posttraumatic headache). Another shortcoming of this literature synthesis is the reliance on published research studies with small sample sizes (Table 4, Table 5, Table 6), short-term treatment paradigms, and follow-up periods. Well-designed clinical trials with sufficient numbers of subjects, longer term treatments, and follow-up periods need to be funded to advance chiropractic care, and spinal manipulation in particular, for the management of patients with headache disorders. As with any literature review and clinical practice guideline, foundational information and published literature are evolving. Studies that may have informed this work may have been published after the conclusion of this study. 
Considerations for Future Research
The GDC consensus is that there is a need for further chiropractic studies with patients with headache disorders.
More high-quality clinical research is needed. Future research requires study designs using active comparators and nontreatment and/or placebo group(s) to enhance the evidence base for patient care. Patient blinding to physical interventions to manage expectancy results is needed and has been explored by researchers in chiropractic for other pain conditions.  The lack of systematically reported studies presents a practical challenge for generating evidence-based treatment recommendations. All future studies should be structured using systematic validated methods (eg, Consolidated Standards of Reporting Trials [CONSORT] and Transparent Reporting of Evaluations with Non-randomized Designs [TREND]).
Systematic reporting of safety data is needed in chiropractic research. All clinical trials must collect and report on potential side effects or harms even if none are observed.
Develop novel quantitative tools for evaluating manual therapy research. Blinding serves to control expectancy effects and nonspecific effects of subject-provider interactions across study groups. It is typically not possible to blind subjects and providers in efficacy studies of manual therapies. Despite inherent limitations, both blinding of subjects and care providers were rated in the research articles by the GDC, since these items are included in high-quality rating instruments.  Advanced research tools for analyzing and subsequent rating of the manual therapy literature are urgently needed.
To advance research on functional outcomes in the chiropractic care of headache. This guideline identified that headache studies use a variable range of measures in evaluating the effect of treatment on health outcomes. Headache frequency, intensity, and duration are the most consistently used outcomes (Tables 46). Serious efforts are needed to include validated patient-centered outcome measures in chiropractic research that are congruent with improvements in daily living and resumption of meaningful routines.
Cost-effectiveness. No research studies were retrieved on cost-effectiveness of spinal manipulation for the treatment of headache disorders. Future clinical trials of spinal manipulation should evaluate cost-effectiveness.
Other research methods are required to develop a full understanding of the balance between benefits and risks. This CPG does not provide a review of all chiropractic treatments. Any omissions reflect gaps in the clinical literature. The type, frequency, dosage, and duration of treatment(s) should be based on guideline recommendations, clinical experience, and knowledge of the patient until higher levels of evidence are available.
There is a baseline of evidence to support chiropractic care, including spinal manipulation, for the management of migraine and cervicogenic headaches. The type, frequency, dosage, and duration of treatment(s) should be based on guideline recommendations, clinical experience, and knowledge of the patient. Evidence for the use of spinal manipulation as an isolated intervention for patients with tension-type headache remains equivocal. More research is needed.
Practice guidelines link the best available evidence to good clinical practice and are only 1 component of an evidence-informed approach to providing good care. This guideline is intended to be a resource for the delivery of chiropractic care for patients with headache. It is a living document and subject to revision with the emergence of new data. Furthermore, it is not a substitute for a practitioner's clinical experience and expertise. This document is not intended to serve as a standard of care. Rather, the guideline attests to the commitment of the profession to advance evidence-based practice through engaging a knowledge exchange and transfer process to support the movement of research knowledge into practice.
Funding Sources and Potential Conflicts of Interest
Funding was provided by the CCA, Canadian Chiropractic Protective Association, and provincial chiropractic contributions from all provinces except British Columbia. This work was sponsored by The CCA and the Federation. No conflicts of interest were reported for this study.
This guideline is a resource for the delivery of chiropractic care for patients with headache.
Spinal manipulation is recommended for the management of patients with migrain
e or cervicogenic headaches.
Multimodal multidisciplinary interventions including massage may benefit patients
Joint mobilization or deep neck flexor exercises may improve symptoms of
Low-load craniocervical mobilization may improve tension-type headaches.
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