Letters to the Editor   |    
Shock-Wave Therapy for Plantar Fasciitis
Rachelle Buchbinder, MBBS(Hons), MSc, FRACP; Andrew Forbes, PhD; Ronnie Ptasznik, MBBS, FRANZCR
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The authors did not receive grants or outside funding in support of their research or preparation of this work. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 2005 Mar 01;87(3):680-a-681
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To The Editor:Dr. Ogden and colleagues recently reported the results of a trial of shock-wave treatment for chronic plantar fasciitis in "Electrohydraulic High-Energy Shock-Wave Treatment for Chronic Plantar Fasciitis" (2004;86:2216-28). We seek clarification about whether this is a reanalysis of a previously published trial1, and, if so, why the sample sizes are substantially different. While the results appear similar, the authors now claim a significant difference in the mean score for the subjective self-assessment of pain at twelve weeks favoring the active treatment group (p = 0.014). While this cannot be verified from the data presented, as no measures of variance are provided, independent t test comparison of mean scores for subjective self-assessment of pain at twelve weeks on the basis of data published in the original trial report submitted to the U.S. Food and Drug Administration demonstrated no significant difference between groups (mean scores [and standard deviation], 3.48 ± 3.11 and 4.18 ± 3.04 for 115 and 114 patients in the active and placebo-treatment groups, respectively; mean difference = 0.7 [95% confidence interval, -0.1 to 1.5; p = 0.08])2.
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