OBJECTIVES: To compare the effects of adding electrical dry needling into a manual therapy (MT) and exercise program on pain, stiffness, function, and disability in individuals with painful knee osteoarthritis (OA).
MATERIALS AND METHODS: In total, 242 participants (n=242) with painful knee OA were randomized to receive 6 weeks of electrical dry needling, MT, and exercise (n=121) or MT and exercise (n=121). The primary outcome was related-disability as assessed by the Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index at 3 months.
RESULTS: Individuals receiving the combination of electrical dry needling, MT, and exercise experienced significantly greater improvements in related-disability (WOMAC: F=35.504; P<0.001) than those receiving MT and exercise alone at 6 weeks and 3 months. Patients receiving electrical dry needling were 1.7 times more likely to have completely stopped taking medication for their pain at 3 months than individuals receiving MT and exercise (OR, 1.6; 95% confidence interval, 1.24-2.01; P=0.001). On the basis of the cutoff score of =5 on the global rating of change, significantly (?=14.887; P<0.001) more patients (n=91, 75%) within the dry needling group achieved a successful outcome compared with the MT and exercise group (n=22, 18%) at 3 months. Effect sizes were large (standardized mean differences >0.82) for all outcome measures in favor of the electrical dry needling group at 3 months.
DISCUSSION: The inclusion of electrical dry needling into a MT and exercise program was more effective for improving pain, function, and related-disability than the application of MT and exercise alone in individuals with painful knee OA.
LEVEL OF EVIDENCE: Level 1b-therapy. Prospectively registered February 10, 2015 on www.clinicaltrials.gov (NCT02373631).
|Rehab Clinician (OT/PT)|
The trial is interesting but doesn't control for the many contextual factors that would drive one combination of treatments to out perform the other, especially for a pain-related outcome.
As always with this study design, the absence of blinding and control (sham acupuncture with/without electricity) may be problematic and should be borne in mind when interpreting the outcomes. Periosteal pecking is intensely painful and there would be no doubt in the mind of the patient that they were receiving the sharp end of the intervention. Add to that electricity, and the gulf 'encouragement' to improve could be compelling.