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Shock wave therapy ineffective for plantar fasciitis. (Patient-Oriented Evidence that Matters).

Buchbinder R, Ptasznik R, Gordon J, Buchanan J, Prabaharan V, Forbes A. Ultrasound-guided extracorporeal shock wave therapy for plantar fasciitis: a randomized controlled trial. JAMA 2002; 288:1364-72.

* BACKGROUND Plantar fasciitis is a common condition seen in primary care affecting up to 10% of the general population during their lifetime. Risk factors include middle age, obesity, prolonged walking, and running. Previous randomized controlled studies of ultrasound-guided ESWT report efficacy in plantar fasciitis. A systematic review from the Cochrane Library reports limited evidence for ESWT, topical corticosteroids, corticosteroid injections, and dorsiflexion night splints, Interestingly, no evidence for effectiveness is reported for other commonly used interventions, including insoles, heel pads, strapping, and surgery. (1)

* POPULATION STUDIED Participants in this study were 166 Australian patients diagnosed with clinical plantar fasciitis, defined as 6 weeks of pain over the plantar aspect of the heel, confirmed by plantar fascia thickening on ultrasound. Patients were referred to a radiology group from primary care, rheumatology, orthopedic surgery, and sports medicine practices. The patients were usually over weight and predominantly female (57%).

* STUDY DESIGN AND VALIDITY Overall this randomized, placebo controlled, double-blind study was well designed. Patients were treated weekly lot 3 consecutive weeks with a total shock wave dose of at least 1000 mJ/[mm.sup.2] or placebo (total dose 6.0 mJ/[mm.sup.2]). Symptoms were assessed at 6 and 12 weeks after treatment. The study used centralized randomization and controlled with low energy, low frequency "sham" ESWT. The intervention and control groups were similar and allocation of treatment was concealed (referring physicians, patients, and therapists did not know what therapy was going to be assigned before study enrollment). Patients and data evaluators were blind to treatment group assignment; however, physical therapists administering therapy were not blinded. Study subjects were surveyed after the study to determine whether they knew which therapy they had received. Blinding was moderately successful (the blinding index was 0.68, in which 1 represents complete blinding, 0 represents no blinding, and 0.5 represents random guessing about which therapy was received). Follow-up was complete with an intention-to-treat analysis (although dropouts were not included in the assessment). The study evaluated patients for 12 weeks, which seems a reasonable length of time to assess for clinical improvement in pain and function.

* OUTCOMES MEASURED The primary outcome measured was overall pain at 12 weeks. Secondary outcomes included overall, morning only, and activity pain; Maryland Foot Score ratings; walking ability: Short Form (SF-36) Health Survey quality-of-life score; and Problem Elicitation Technique score at 6 and 12 weeks. The Problem Elicitation Technique tracks changes in perceived disability and problems commonly reported by patients with plantar fasciitis, such as inability to participate in sports.

* RESULTS A total of 160 (96%) patients completed the 15-week study. Overall, both groups' pain and function improved, but no statistically significant difference was noted in pain and function at 6 or 12 weeks. Only 1 outcome measure, the social function subset of the SF-36, showed statistically significant improvement in the placebo group at 6 weeks but not at 12 weeks. The power of the study was adequate for the primary outcome measure.

RECOMMENDATIONS FOR CLINICAL PRACTICE

Extracorporeal shock wave therapy (ESWT) cannot be recommended to improve pain and function in patients with plantar fasciitis based on the results of this study. Although previous studies do report a benefit from ESWT, this study appears to represent a higher level of evidence than was previously available for evaluating the efficacy of this therapy. An updated meta-analysis combining all the studies on ESWT will be useful.

REFERENCE

(1.) Crawford F, Atkins D. Edwards J. Interventions for treating plantar heel pain. Cochrane Database of Syst Rev 2000;(3):CD000416.
Peter S. Ham, MD; and Scott Strayer, MD, MPH
University of Virginia Department of Family
Medicine, Charlottesville
E-Mail: ph2t@hscmail.mcc.virginia.edu
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Article Details
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Author:Ham, Peter S.; Strayer, Scott
Publication:Journal of Family Practice
Article Type:Abstract
Date:Dec 1, 2002
Words:637
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