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Permanent link (DOI): https://doi.org/10.7939/R3H70X
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Therapeutic Contextual Factors in Physiotherapy: Magnitude, Mechanisms and Contributors of Placebo Mediated Analgesia in Chronic Low Back Pain Open Access
- Other title
low back pain
- Type of item
- Degree grantor
University of Alberta
- Author or creator
Fuentes Contreras, Jorge Patricio
- Supervisor and department
Dr. Douglas Gross, Department of Physical Therapy
Dr. David Magee, Department of Physical Therapy
- Examining committee member and department
Saifee Rashiq, BMedSci, BM BS, MSc (Epid) DA (UK), FRCPC, Professor Department of Anaesthesiology and Pain Medicine, University of Alberta.
Sharon Warren, PhD. Professor Faculty of Rehabilitation Medicine, University of Alberta
Bruce Dick, Ph.D. Associate Professor Depts. of Anesthesiology and Pain Medicine, Psychiatry & Pediatrics, University of Alberta
Anthony Joyce, Ph.D. Professor, Department of Psychiatry University of Alberta
Steven George, Ph.D. Associate Professor, Assistant Department Chair, and DPT Program Administrator University of Florida Department of Physical Therapy.
Faculty of Rehabilitation Medicine
- Date accepted
- Graduation date
Doctor of Philosophy
- Degree level
Mechanisms through which physiotherapy influence musculoskeletal pain include both the specific ingredient of an intervention as well as contextual factors inherent to clinical encounters including the therapist, patient and setting. These contextual factors are often termed “non-specific” effects and are associated with the placebo effect. Although well documented in other areas, the impact of contextual factors in treatment of low back pain (LBP) is unknown. In addition, the contributors to the physiotherapy placebo response in LBP have not been elucidated.
This project investigated the effect of contextual factors in patients with LBP receiving either active or sham interferential current therapy (IFC). Determinants of a favorable response to the placebo response were also explored. A sample of 117 chronic LBP participants were randomly assigned into 4 groups: active limited (AL) included the application of active IFC in a limited therapeutic encounter (i.e. limited patient-practitioner interaction), sham limited (SL) included sham IFC in a limited therapeutic encounter, active enhanced (AE) included active IFC in an enhanced therapeutic encounter (i.e. supportive patient-practitioner relationship, encouragement), and sham enhanced (SE) included sham IFC in an enhanced therapeutic encounter. Outcomes included pain intensity (PI-NRS) and muscle pain sensitivity (PPT). Analysis included MANOVA, and logistic regression. Also, clinical significance was determined.
There were statistically significant differences between groups on PPT’s and PI-NRS (baseline and after treatment). Mean differences in PI-NRS were 18.3 mm, 10.0 mm, 31.4 mm, and 22.2 mm, for the groups AL, SL, AE, and SE respectively. Clinically important effect sizes were found. Mean differences in PPT’s were 1.2 kg, 0.3 kg, 2.0 kg, and 1.7 kg for the group AL, SL, AE, and SE respectively. Again, clinically important effect sizes were found. The level of therapeutic alliance and pain duration were the factors associated with the placebo response.
Results highlight the important role of contextual factors in the treatment of patients with chronic LBP. Enhanced therapeutic relationship was associated with meaningful clinical improvement. Also, perceived therapeutic alliance was associated with placebo response. Factors other than the specific ingredient of a treatment may have a large role in achieving positive clinical outcomes, and exploring them is central to physiotherapy practice.
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- Citation for previous publication
Fuentes JP, Armijo-Olivo S, Magee DJ, Gross DP. Effectiveness of Interferential Current Therapy in the Management of Musculoskeletal Pain: Systematic Review and Meta-Analysis Physical therapy 2010; 90 (9):1219-1238. Fuentes JP, Armijo-Olivo S, Magee DJ, Gross DP. A preliminary Investigation into the Effects of Interferential Current Therapy and Placebo on Pressure Pain Sensitivity: a Random Crossover Placebo Controlled Study. Physiotherapy 2011; 97(9):291-301.
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