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Background. 'Mechanical Diagnosis and Therapy' (MDT) (also known as the McKenzie method), like other interventions for low back pain (LBP), has been found to have small effects for people with LBP. It is possible that a group of patients respond best to MDT and have larger effects. Identification of patients who respond best to MDT compared with other interventions would be an important finding. Objective. The purpose of the study was to investigate whether baseline characteristics of patients with chronic LBP, already classified as derangement syndrome, can identify those who respond better to MDT compared with Back School. Methods. This study was a secondary analysis of data from a previous trial comparing MDT with Back School in 148 patients with chronic LBP. Only patients classified at baseline assessment as being in the directional preference group (n=140) were included. The effect modifiers tested were: clear centralization versus directional preference only, baseline pain location, baseline pain intensity, and age. The primary outcome measures for this study were pain intensity and disability at the end of treatment (1 month). Treatment effect modification was evaluated by assessing the group versus predictor interaction terms from linear regression models. Interactions ≥ 1.0 for pain and [greater than or equal to] 3 for disability were considered clinically important. Results. Being older met our criteria for being a potentially important effect modifier; however, the effect occurred in the opposite direction to our hypothesis. Older people had 1.27 points more benefit in pain reduction from MDT (compared with Back School) than younger participants after 1 month of treatment. Limitations. The sample (n = 140) was powered to detect the main effects of treatment but not to detect the interactions of the potential treatment effect modifiers. Conclusions. The results of the study suggest older age may be an important factor that can be considered as a treatment effect modifier for patients with chronic LBP receiving MDT. As the main trial was not powered for the investigation of subgroups, the results of this secondary analysis have to be interpreted cautiously, and replication is needed., The cause of low back pain (LBP) cannot be definitively identified in the majority of cases, and as such the label 'nonspecific low back pain' (NSLBP) is widely used. (1-3) [...]

Background. The McKenzie method is widely used as an active intervention in the treatment of patients with nonspecific low back pain. Although the McKenzie method has been compared with several other interventions, it is not yet known whether this method is superior to placebo in patients with chronic low back pain. Objective. The purpose of this trial is to assess the efficacy of the McKenzie method in patients with chronic nonspecific low back pain. Design. An assessor-blinded, 2-arm, randomized placebo-controlled trial will be conducted. Setting. This study will be conducted in physical therapy clinics in Sao Paulo, Brazil. Participants. The participants will be 148 patients seeking care for chronic nonspecific low back pain. Intervention. Participants will be randomly allocated to 1 of 2 treatment groups: (1) McKenzie method or (2) placebo therapy (detuned ultrasound and shortwave therapy). Each group will receive 10 sessions of 30 minutes each (2 sessions per week over 5 weeks). Measurements. The clinical outcomes will be obtained at the completion of treatment (5 weeks) and at 3, 6, and 12 months after randomization. The primary outcomes will be pain intensity (measured with the Pain Numerical Rating Scale) and disability (measured with the Roland-Morris Disability Questionnaire) at the completion of treatment. The secondary outcomes will be pain intensity; disability and function; kinesiophobia and global perceived effect at 3, 6, and 12 months after randomization; and kinesiophobia and global perceived effect at completion of treatment. The data will be collected by a blinded assessor. Limitations. Therapists will not be blinded. Conclusions. This will be the first trial to compare the McKenzie method with placebo therapy in patients with chronic nonspecific low back pain. The results of this study will contribute to better management of this population., Low back pain is a major health condition associated with a high rate of absenteeism from work and a more frequent use of health services and work leave entitlements. (1) [...]

Background. Back School and McKenzie methods are popular active treatment approaches that include both exercises and information for patients with chronic nonspecific low back pain. Objective. The purpose of this study was to compare the effectiveness of Back School and McKenzie methods in patients with chronic nonspecific low back pain. Design. The study was a prospectively registered, 2-arm randomized controlled trial with a blinded assessor. Setting. The study was conducted in the outpatient physical therapy clinic in Sao Paulo, Brazil. Patients. The study participants were 148 patients with chronic nonspecific low back pain. Interventions. The 4-week treatment program (one session/week) was based on the Back School (delivered to the group) or McKenzie (delivered individually) principles. The participants also were instructed to perform a daily set of home exercises. Measurements. Clinical outcomes were assessed at follow-up appointments at 1, 3, and 6 months after randomization. Primary outcome measures were pain intensity (measured by the 0-10 pain numerical rating scale) and disability (measured by the 24-item Roland-Morris Disability Questionnaire) 1 month after randomization. Secondary outcome measures were pain intensity and disability at 3 and 6 months after randomization, quality of life (measured by the World Health Organization Quality of Life-BREF instrument) at 1, 3, and 6 months after randomization, and trunk flexion range of motion measured by an inclinometer at 1 month after randomization. The data were collected by a blinded assessor. Results. Participants allocated to the McKenzie group had greater improvements in disability at 1 month (mean effect=2.37 points, 95% confidence interval=0.76 to 3.99) but not for pain (mean effect=0.66 points, 95% confidence interval = -0.29 to 1.62). No between-group differences were observed for all secondary outcome measures. Limitations. It was not possible to monitor the home exercise program. Therapists and participants were not blinded. Conclusions. The McKenzie method (a more resource-intensive intervention) was slightly more effective than the Back School method for disability, but not for pain intensity immediately after treatment in participants with chronic low back pain., Chronic nonspecific low back pain (ie, low back pain of at least 12 weeks' duration and without a specific cause) (1,2) is one of the most common health conditions worldwide. [...]