Spinal Manipulation and Home Exercise With Advice
for Subacute and Chronic Back-related Leg Pain:
A Trial With Adaptive Allocation

This section is compiled by Frank M. Painter, D.C.
Send all comments or additions to:

FROM:   Annals of Internal Medicine 2014 (Sep 16);   161 (6):   381—391 ~ FULL TEXT

Gert Bronfort, DC, PhD; Maria A. Hondras, DC, MPH; Craig A. Schulz, DC, MS;
Roni L. Evans, DC, PhD; Cynthia R. Long, PhD; and Richard Grimm, MD, PhD

University of Minnesota,
Northwestern Health Sciences University, and
Berman Center for Outcomes and Clinical Research at
the Minneapolis Medical Research Foundation,
Minneapolis, Minnesota, and
Palmer Center for Chiropractic Research,
Davenport, Iowa.

BACKGROUND:   Back-related leg pain (BRLP) is often disabling and costly, and there is a paucity of research to guide its management.

OBJECTIVE:   To determine whether spinal manipulative therapy (SMT) plus home exercise and advice (HEA) compared with HEA alone reduces leg pain in the short and long term in adults with BRLP.

DESIGN:   Controlled pragmatic trial with allocation by minimization conducted from 2007 to 2011.
(ClinicalTrials.gov: NCT00494065).

SETTING:   2 research centers (Minnesota and Iowa).

PATIENTS:   Persons aged 21 years or older with BRLP for least 4 weeks.

INTERVENTION:   12 weeks of SMT plus HEA or HEA alone.

MEASUREMENTS:   The primary outcome was patient-rated BRLP at 12 and 52 weeks. Secondary outcomes were self-reported low back pain, disability, global improvement, satisfaction, medication use, and general health status at 12 and 52 weeks. Blinded objective tests were done at 12 weeks.

RESULTS:   Of the 192 enrolled patients, 191 (99%) provided follow-up data at 12 weeks and 179 (93%) at 52 weeks. For leg pain, SMT plus HEA had a clinically important advantage over home exercise and advice (HEA) (difference, 10 percentage points [95% CI, 2 to 19]; P=0.008) at 12 weeks but not at 52 weeks (difference, 7 percentage points [CI, -2 to 15]; P=0.146). Nearly all secondary outcomes improved more with SMT plus HEA at 12 weeks, but only global improvement, satisfaction, and medication use had sustained improvements at 52 weeks. No serious treatment-related adverse events or deaths occurred.

LIMITATION:   Patients and providers could not be blinded.

CONCLUSION:   For patients with back-related leg pain (BRLP), SMT plus home exercise and advice (HEA) was more effective than HEA alone after 12 weeks, but the benefit was sustained only for some secondary outcomes at 52 weeks.

From the FULL TEXT Article:


Back-related leg pain (BRLP) is an important symptom commonly associated with pervasive low back pain (LBP) conditions and, despite its socioeconomic effect, has been generally understudied. With poorer prognosis and quality of life, persons with BRLP have greater pain severity and incur more work loss, medication use, surgery, and health-related costs than those with uncomplicated LBP. [1–6]

Most patients with BRLP are treated with prescription medications and injections, although little to no evidence supports their use. [7, 8] Surgical approaches are also commonly applied, although there is only some evidence for short-term effectiveness compared with less invasive treatments. [9] Concerns are mounting about the overuse, costs, and safety of these conventional medical treatments [10–18], warranting identification of more conservative treatment options. Spinal manipulative therapy (SMT), exercise, and education promoting self-management are increasingly recommended as low-risk strategies for BRLP. [19] Although limited, evidence shows that these conservative approaches can be effective. [20–26] A recent systematic review by our group showed that SMT is superior to sham SMT for acute BRLP in the short and long term; however, the evidence for subacute and chronic BRLP is inconclusive, and high-quality research is needed to inform clinical and health policy decisions. [20] The underlying mechanisms of SMT seem to be multifactorial, including improvement in spinal stiffness, muscle recruitment, and synaptic efficacy of central neurons. [27, 28]

The purpose of this study was to test the hypothesis that the addition of SMT to home exercise and advice (HEA) would be more effective than HEA alone for patients with subacute and chronic BRLP.


      Design Overview

This pragmatic trial used a parallel design with allocation by minimization and has been described previously. [29] Patients were recruited between 2007 and 2010, and follow-up was completed in 2011. Institutional review boards approved the study protocol, and all patients provided written consent. The primary outcomes and most secondary outcomes were self-reported; objective measures were obtained by blinded examiners. There were no important changes to methods after trial commencement.

      Settings and Patients

The trial was conducted at institution-affiliated research clinics at Northwestern Health Sciences University (Minneapolis, Minnesota) and Palmer College of Chiropractic (Davenport, Iowa). Patients were recruited through newspaper advertisements, direct mail, and community posters. Interested patients were initially screened by telephone interviews, followed by 2 in-person baseline evaluation visits. Inclusion criteria were age 21 years or older; BRLP based on Quebec Task Force on Spinal Disorders classifications 2, 3, 4, or 6 (radiating pain into the proximal or distal part of the lower extremity, with or without neurologic signs) (30); BRLP severity of 3 or greater (scale of 0 to 10); a current episode of 4 weeks or more; and a stable prescription medication plan in the previous month. Exclusion criteria were Quebec Task Force on Spinal Disorders classifications of 1, 5, 7, 8, 9, 10, and 11 (pain without radiation into the lower extremities, progressive neurologic deficits, the cauda equina syndrome, spinal fracture, spinal stenosis, surgical lumbar spine fusion, several incidents of lumbar spine surgery, chronic pain syndrome, visceral diseases, compression fractures or metastases, blood clotting disorders, severe osteoporosis, and inflammatory or destructive tissue changes of the spine). Patients could not be receiving ongoing treatment of leg pain or LBP; be pregnant or nursing; have current or pending litigation for worker’s compensation, disability, or personal injury; be unable to read or comprehend English; or have evidence of substance abuse.


A Web-based program assigned patients to treatment after the second baseline visit using a minimization algorithm based on the Taves method [31], balancing on 7 baseline characteristics previously shown to influence outcomes. [32–34] Baseline characteristics included age, BRLP duration, neurologic signs, distress, positive straight leg raise, time spent driving a vehicle, and pain aggravation with coughing or sneezing. Patients were assigned in a 1:1 ratio, stratified by site. The allocation algorithm was prepared by the study statistician before enrollment, and its administration was concealed from study personnel.


The intervention protocols were developed and tested in previous pilot studies. [32, 33] Both interventions were intended to be pragmatic in nature (for example, modified to patient presentation and needs) and were informed by commonly recommended clinical practices, patient preferences, and promising research evidence. [19, 35–38]

Eleven chiropractors with a minimum of 5 years of practice experience delivered SMT in the SMT plus HEA group. Thirteen providers (7 chiropractors, 5 exercise therapists, and 1 personal trainer) delivered the HEA intervention. When possible, patients worked with the same providers during the 12–week course of care; however, to accommodate patient and provider schedules during the intervention period, providers were trained to comanage patients. Treatment fidelity was facilitated through standardized training, manuals of operation, and clinical documentation forms that were monitored weekly by research staff.

      SMT Plus HEA Group

As many as 20 SMT visits were allowed, each lasting 10 to 20 minutes, including a brief history and examination. Patients assigned to SMT plus HEA also attended 4 HEA visits, as described in the HEA Group section. For SMT visits, the primary focus of treatment was on manual techniques (including high-velocity, low amplitude thrust procedures or low-velocity, variable amplitude mobilization maneuvers to the lumbar vertebral or sacroiliac joints). The specific spinal level treated and the number and frequency of SMT visits were determined by the clinician on the basis of patient-reported symptoms, palpation, and pain provocation tests. [39] Adjunct therapies to facilitate SMT were used as needed and included light soft-tissue techniques (that is, active and passive muscle stretching and ischemic compression of tender points) and hot or cold packs. To facilitate adherence to HEA, chiropractors asked about patients’ adherence, reaffirmed main HEA messages, and answered questions as needed.

      HEA Group

Home exercise and advice were delivered in four 1–hour, one-on-one visits during the 12–week intervention. The main program goals were to provide patients with the tools to manage existing pain, prevent pain recurrences, and facilitate engagement in daily activities.

Instruction and practice were provided for positioning and stabilization exercises to enhance mobility and increase trunk endurance. These were individualized to patients’ lifestyles, clinical characteristics (including positional sensitivities), and fitness levels. Positioning exercises included extension and flexion motion cycles (patients were encouraged to perform 25 repetitions 3 times per day in the lying, standing, or seated position). [33, 40] Stabilization exercises included pelvic tilt, quadruped, bridging, abdominal curl-ups, and side bridging with positional variations appropriate to patients’ tolerance and abilities. [41] Patients were instructed to do 8 to 12 repetitions of each stabilization exercise every other day.

Patients were also instructed in methods for developing spine posture awareness related to their activities of daily living, such as lifting, pushing and pulling, sitting, and getting out of bed. [42] Information about simple pain-management techniques, including cold, heat, and movement, was also provided.

Printed materials were distributed to take home and review. They included instructions of exercises with photos and a modification of the Back in Action book [43], emphasizing movement and restoration of normal function and fitness. [35, 44]

To facilitate adherence to HEA, providers called or e-mailed patients 3 times (at 1, 4, and 9 weeks) to reaffirm main messages and answer exercise-related questions.

      Outcomes and Measurements

Patients’ demographic and clinical characteristics were collected at their first baseline visit through self-report questionnaires, histories, and physical examinations. Selfreported outcomes were collected at the baseline visit and at 3, 12, 26, and 52 weeks via questionnaires independent of study personnel influence. Patients were queried in each questionnaire about attempts to influence their responses.

The primary outcome measure was patient-rated typical level of leg pain during the past week using an 11– point numerical rating scale, a reliable, valid, and important patient-centered outcome. [36, 45–47] The primary end points were 12 weeks, which was the end of the intervention phase, and the 52–week follow-up.

A complete description of all secondary outcome measures is provided elsewhere. [29] The measures reported in this article include LBP, disability measured with the modified Roland–Morris Disability Questionnaire [48–50], physical and mental health status using the Short Form-36 Health Survey (SF–36) [51, 52], patient satisfaction [53], global improvement [53], and frequency of medication use for back and leg pain in the past week. [53]

Patient expectations about treatment were measured using an 11–box numerical rating scale (0 meaning treatment was not at all helpful and 10 meaning it was extremely helpful) at baseline. Expected side effects were measured using a self-report questionnaire by indicating presence or absence of 7 symptoms as well as bothersomeness on an 11–box numerical rating scale (0 meaning symptoms were not at all bothersome and 10 meaning they were extremely bothersome).

Secondary, biomechanical, and clinical objective outcomes were straight leg raise and muscle endurance tests at baseline and 12 weeks collected by examiners who were independent of treatment delivery and masked to group assignment. Three-dimensional lumbar motion, standing postural sway, sudden load response, self-reported fear avoidance, self-efficacy, and qualitative data about patient perceptions of care were also collected and will be reported separately.

      Statistical Analysis

Sample size was calculated to ensure 85% power to detect an 8–percentage point mean difference between groups in patient-rated leg pain; 8 to 11 percentage points have been recommended as a minimally important group difference in pain and disability for LBP studies. [54] We assumed an SD of 17 percentage points and 17% loss to follow-up on the basis of our latest pilot study [33] and a 0.05 level of significance for a 2–tailed test at one end point to calculate a target sample size of 96 patients per group, totaling 192.

We used an intention-to-treat approach in which patients were analyzed according to their original treatment assignment. All observed data were used in the analyses. Data analyses were done using SAS, version 9.3 (SAS Institute). All regression models included terms for site and the variables used in the minimization algorithm for treatment allocation. Dependent on the outcome variable, adjusted mean differences or odds ratios and 95% CIs between groups at weeks 12 and 52 were presented.

The primary outcome variable, patient-rated leg pain, was modeled with mixed-effects regression over baseline (the average value obtained at the 2 baseline visits) and 3, 12, 26, and 52 weeks. After assuming that group means were the same at baseline, the additional terms in the model were time (as a categorical variable) and site-bygroup and time-by-group interactions. The site-by-group interaction was removed if it was not significant at the 0.05 level. Because we tested between-group differences at 2 primary end points, we used the Bonferroni method to control for 2 tests.

Responder analyses were done for pain reduction of 50%, 75%, and 100% at the end of treatment at 12 weeks and at the 52–week follow-up. [55–57] The differences in proportions between groups were calculated for patients with data at each end point based on each criterion, and 95% CIs were based on the Wilson score method. [58]

The secondary outcome variables, patient-rated LBP scores, disability scores, SF-36 physical and mental health component scores, global improvement scores, and satisfaction scores, were analyzed with the same methods as patient-rated leg pain but without controlling for multiple testing. Two approaches were used for sensitivity analyses to examine the possible effects of missing data on the results (Appendix and Appendix Tables 1 and 2, available at www.annals.org). The ordinal categorical variable representing the number of days that patients used any medications over the past week for leg pain or LBP was analyzed at baseline and at 3, 12, 26, and 52 weeks with a proportional odds model. Generalized estimating equations using all observed data with an independent covariance structure were used to fit the model. The change in the biomechanical variables from baseline to end of treatment were evaluated by analysis of covariance.

      Role of the Funding Source

This trial was funded by the U.S. Department of Health and Human Services. The funding source did not participate in the study design, data collection, analysis and interpretation of the data, or writing of this article.


A total of 1132 patients were initially screened by phone, and 658 attended 1 or 2 clinic baseline visits. We enrolled 192 patients: 70 at the Iowa site and 122 at the Minnesota site (Figure 1). Allocation resulted in baseline comparability between groups. Table 1 summarizes the demographic and clinical characteristics of enrolled patients. Approximately 90% of the patients in both groups had chronic BRLP.

Figure 1.   Study flow diagram.

Table 1A.   Baseline Characteristics*

Table 1B.  

      Study Treatments

Of the 192 enrolled patients, 191 (99%) provided follow-up data at 12 weeks and 179 (93%) at 52 weeks. Overall, 94% of study patients attended their prescribed treatment visits: 98% in the SMT plus HEA group and 91% in the HEA group. The mean number of HEA visits was 3.8 (SD, 0.6; median, 4.0) in the SMT plus HEA group and 3.6 (SD, 1.0; median, 4.0) in the HEA group. The mean number of SMT visits was 14.6 (SD, 3.8; median, 16) in the SMT plus HEA group. Each HEA provider delivered care to approximately the same number of patients in each treatment group (range for SMT plus HEA group, 1 to 38; range for HEA group, 2 to 47); 7 chiropractors who delivered SMT plus HEA also delivered at least 1 HEA session. Patients receiving SMT plus HEA had slightly greater expectations of improvement (scale of 0 to 10) from their assigned treatment (mean, 9.0 [SD, 1.8] than the HEA group (mean, 7.6 [SD, 2.0]). One patient reported being influenced on how he answered the questionnaire at 12 weeks and indicated that it was by a person who was not involved with the study. There were no crossovers of treatment assignments during the trial. Group differences have been standardized into percentage points for all outcomes to facilitate interpretation of effect magnitude. The adjusted and unadjusted results were very similar and did not affect the conclusions.

      Primary Outcome

Table 2

Figure 2

Table 3

On the basis of the adjusted means of the primary outcome measure, patient-rated leg pain, there was an advantage of SMT plus HEA over HEA alone after 12 weeks (10 percentage points [95% CI, 2 to 19]; P = 0.008) but not at the 52–week follow-up (7 percentage points [CI, –2 to 15]; P = 0.146) (Table 2). Figure 2 shows the adjusted group means of patient-rated leg pain over time. At 12 weeks, 37% of patients receiving SMT plus HEA had at least a 75% reduction in leg pain, compared with 19% in the HEA group. Twenty percent of patients receiving SMT plus HEA had a 100% reduction, compared with 5% in the HEA group (Table 2).

      Secondary Outcomes

At 12 weeks, the adjusted means in the SMT plus HEA group were better than those in the HEA group for LBP (difference, 9 percentage points [CI, 3 to 16]; P = 0.005) (Table 2), disability (difference, 11 percentage points [CI, 5 to 17]; P < 0.001) (Table 3), SF-36 physical component score (difference, 3.4 percentage points [CI, 1.0 to 5.8]; P = 0.006) (Appendix Table 3, available at www.annals.org), global improvement (difference, 10 percentage points [CI, 14 to 5]; P = 0.02) (Table 3), and satisfaction (difference, 13 percentage points [CI, 17 to 9]; P < 0.001) (Table 3). There were no significant between-group differences for the SF-36 mental health component score at 12 weeks (Appendix Table 3).

At 52 weeks, the SMT plus HEA group sustained better global improvement (difference, 6 percentage points [CI, 11 to 1]; P = 0.02) (Table 3) and satisfaction (difference, 10 percentage points [CI, 16 to 6]; P < 0.001) (Table 3) than did the HEA group. However, no significant long-term differences were seen for LBP, disability, and SF-36 mental health and physical component scores (Tables 2 and 3 and Appendix Table 3).

The proportions of patients still using medication for leg or back pain at 12 weeks was 56% for SMT plus HEA versus 63% for HEA and 42% versus 66% at week 52, respectively. The odds of the SMT plus HEA group having fewer versus more medication days was 1.8 (CI, 1.0 to 3.1) times that for the HEA group at 12 weeks and 2.6 (CI, 1.4 to 4.7) at 52 weeks.

Adjusted group means in patient-rated LBP, disability, and global improvement over time are shown in Figure 2. The sensitivity analyses for the assumptions that data were missing at random and were not missing at random showed estimated model coefficients of consistent magnitude and in the same direction as the results reported here. All statistically significant between-group differences remained the same (Appendix).

The SMT plus HEA group had better extension trunk endurance (14.2 seconds; P = 0.001) (Appendix Table 4, available at www.annals.org) and performed better in the straight leg raise test, although it was of borderline significance (left, P = 0.054; right, P = 0.051) (Appendix Table 4). There were no between-group differences in flexion and side bridge endurance.

      Nonstudy Treatments

During the 12–week intervention, 10 patients reported visits to nonstudy health care providers for their leg pain or LBP: 3 in the SMT plus HEA group (2 chiropractic visits and 1 massage therapy visit) and 7 in the HEA group (3 multiple provider visits, 2 medical physician visits, 1 chiropractic visit, and 1 massage therapy visit). By 52 weeks, 81 patients had sought additional health care since the end of the study treatment phase: 38 in the SMT plus HEA group and 43 in the HEA group.

      Adverse Events

Table 4

Five serious adverse events occurred during the trial, all unrelated to study interventions (1 due to bowel obstruction in the HEA group and 4 due to anaphylaxis, sports-related trauma, heart condition, and menorrhagia in the SMT plus HEA group). No deaths occurred among the enrolled patients. Expected adverse events were mild to moderate, self-limiting, and reported by 30% of patients in the SMT plus HEA group and 42% in the HEA group (Table 4).


To our knowledge, this is one of the first adequately powered pragmatic trials to focus on patients with subacute and chronic BRLP. Both groups demonstrated improvement during the 12–week intervention. Similar patterns were seen for all outcome measures, showing that SMT plus HEA was more effective than HEA alone on all selfreport outcomes except SF-36 mental health status after 12 weeks of treatment. This short-term advantage for the SMT plus HEA group was sustained only for global improvement, medication use, and satisfaction at the 52–week follow-up.

Determination of the clinical importance of betweengroup mean differences has not been well-standardized; however, we facilitated interpretation by considering many factors in aggregate, including the magnitude of group differences (54), consistency of results, durability of treatment effect, intervention safety and tolerance, and patients’ ability to adhere to treatment. [59]

The magnitude of 10 percentage points for the group differences of the primary outcome, leg pain, translates to a medium effect size of 0.6 [60] in favor of SMT plus HEA, which is considered clinically important. Further, we saw consistent statistically significant and clinically important group differences for nearly all other outcomes in the short term and for some secondary outcomes in the long term in favor of SMT plus HEA, including global improvement, an important and recommended patient-centered outcome. [45, 61] Group differences in the responder analyses for patient-rated leg pain consistently favored SMT plus HEA. The SMT plus HEA group had less aggravation of leg pain. Of importance, patients receiving SMT plus HEA used less medication during the treatment phase and at the 52–week follow-up. On the basis of these factors, we consider the group differences in aggregate in this trial to be clinically important, consistently favoring SMT plus HEA over HEA alone, especially in the short term.

Various terms describe radiating leg pain associated with back pain (such as radiculopathy, sciatica, and BRLP). There is a need for consensus on the classification and definition of radiating leg pain to facilitate comparison between studies. [62] We used the term BRLP to be consistent with the Quebec Task Force on Spinal Disorders Classification Taxonomy. [30] Back-related leg pain was defined by a constellation of symptoms characterized by radiating pain originating from the lumbar spine and traveling into the proximal or distal lower extremity with or without neurologic signs.

There is currently no first-line therapy for BRLP that is clearly supported by a strong evidence base. This is illustrated by recent systematic reviews that found insufficient evidence to confidently guide the use of prescription medication for the effective management of BRLP. [7] Further, epidural corticosteroid injections have been shown to provide only short-term relief of leg pain and disability for patients with BRLP. [8] Surgery for BRLP associated with image-verified disc herniation has been shown to be superior to conservative interventions only in the short term. [9, 63] The lack of evidence is further compounded by growing concerns about the safety of these commonly used interventions. [10–18]

Before this study, there was moderate-quality evidence that SMT is superior to sham SMT for acute BRLP in the short and long term; however, the evidence for subacute and chronic BRLP was inconclusive because of poor study quality. This evidence was based on conclusions from an earlier systematic review by our group [20], which searched MEDLINE, EMBASE, CINAHL, Index to Chiropractic Literature, Mantis, PEDro, and the Cochrane Library for all randomized trials published through July 2010. Eleven trials were identified, 8 of which included patients with subacute or chronic BLRP and none of which were considered to be at low risk of bias (for example, high-quality). We did an updated search through April 2014, using the same search strategies described previously. We identified a small randomized study of surgical candidates for chronic sciatica that found similar outcomes for spinal manipulation and surgery. [24] Because of the small sample size and lack of baseline comparability, we consider that study to be at high risk of bias. Thus, our current trial adds to the much-needed evidence base about SMT for subacute and chronic BRLP.

The trial has several strengths, including a rigorous design and interventions intended to be pragmatic in nature and reflect clinical practice, patient needs, and the best available research. Also, patients older than 65 years were included, resulting in a greater mean age than in similar studies (but with similar clinical characteristics to other trials, including primary care settings), enhancing generalizability. [64–66] The study is limited by the inability to blind patients and providers to the nature of the treatments and differentiate between the specific treatment effects and contextual (nonspecific) effects (such as patient–provider interactions). Qualitative data collection examining patients’ perspectives will shed more light on these issues and are planned for future publications. This study was not designed to assess the effectiveness of SMT alone. Although that is a worthwhile question, this trial was intentionally pragmatic in nature, comparing the relative clinical effectiveness of commonly used treatment approaches by approximating how they are delivered in practice. [67]

Given the dearth of high-quality research investigating conservative interventions for BRLP, there are several opportunities for future research, including those that directly compare manual therapy with commonly used medical treatments and address cost-effectiveness. Further qualitative studies would be useful in identifying potential mediators and moderators of outcome to aid in individualizing treatments to best meet the preferences and abilities of patients with BRLP.

For patients with subacute and chronic BRLP, SMT in addition to HEA is a safe and effective conservative treatment approach, resulting in better short-term outcomes than HEA alone.


The authors thank the coinvestigators at both sites for their collaboration to develop and analyze the biomechanical objective outcome measures and qualitative data, which will be reported elsewhere. The authors also thank the research patients, clinicians, therapists, and staff for the successful conduct of this trial.

Grant Support:

By the Health Resources and Services Administration, U.S. Department of Health and Human Services (grant R18HP07638).

Reproducible Research Statement:

Study protocol: Available at http://chiromt.com/content/19/1/8. Statistical code: Available from Dr. Long (email, long_c@palmer.edu). Data set: Not available.


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