Dear Editor, In “letter to editor,” authors Tuner and Hode [1] commented on our study regarding laser therapy on rheumatoid hands [2]. The authors calculated the energy applied per point correctly (0.18 J); however, they did not calculate the total maximal energy administered on each hand, as the applications on the proximal interphalanges, which also received low-level laser therapy (LLLT) on 20 points, were not counted. Thereby, totaling 8.28 J rather than 4.68 J and on average, the patients received 7.56 J per treatment. The doses recommended by the World Association for Laser Therapy mentioned by the authors refer to doses for “arthritis in the hands.” The recommendation does not specify the disease for which the dose is destined, and there is no explanation of how the values were determined. Rheumatoid arthritis (RA) is one of the most important rheumatic diseases and has specific particularities. It is a chronic, autoimmune, systemic inflammatory disorder of unknown etiology that may affect many tissues and organs but principally the synovial joints [3, 4]. In the literature, there are laboratory and animal studies in favor of LLLT for joint inflammation [5–10]; however, few authors have studied the use of LLLT on the hands of patients with RA and we will discuss these papers below. Bliddal et al. (1987) [11] studied 17 patients to determine the efficacy of LLLT on AR of the 36 hands, but found no statistically significant differences 37 between the experimental and control groups. The energy output was 3 J per treatment and the authors concluded that LLLT was not effective on RA. With the same objective, Palmgren et al. (1989) [12] studied 35 patients using an energy output of 7.2 J per treatment and concluded that the intervention was effective to treat the hands on patients with RA. Johannsen et al. (1994) [13] also assessed 22 patients to determine the effectiveness of LLLT on RA of the hands. The energy output per treatment was 23.2 J. As there were no statistically significant differences between the experimental and control groups, the authors state that LLLT is not indicated for the treatment of these patients. Hall et al. (1994) [14] studied 40 patients with the same objective using an energy output of 36 J per treatment. The authors found no statistically significant differences favoring the experimental group and do not recommend the use of LLLT on the hands of patients with RA. Bjordal et al. (2003) [15] carried out a systematic review on doses of low-level laser for joint pain in chronic diseases and report that energy outputs between 0.4 and 19 J are ideal for a reduction in inflammation. Ottawa Panel (2004) [16], Brosseau et al. (2005) [17], and Christie et al. (2007) [18] also carried out systematic reviews on the use of LLLT for RA, which included the studies discussed above [11–14]. In the literature, we found that the doses, powers, wavelengths, and energy outputs vary between studies on LLLT and RA, with the energy applied to the hands of patients ranging from 3 to 36 J. All authors recommend further studies in this field. We performed a controlled, double-blind study, which demonstrated that, using the parameters most often S. M. Meireles :A. Jones : J. Natour Rheumatology Rehabilitation Section, Rheumatology Division, Federal University of Sao Paulo, Sao Paulo, Brazil
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