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Table 2 Randomised LLLT-trials excluded for not meeting criteria of valid procedures for active laser and placebo laser treatment.

From: A systematic review with procedural assessments and meta-analysis of Low Level Laser Therapy in lateral elbow tendinopathy (tennis elbow)

Study by first author Method score Wave-length Application technique Result Reason for exclusion
Haker [43] 6 904 Tendon No significant differences Photograph in trial report shows that the laser probe was kept in skin contact and thereby violated the manufacturers' recommendation of a keeping the laser head at a distance of 10 cm. This violation caused a central blind spot of ca 3 cm2 which left the tendon pathology unexposed to LLLT (See Figure 2)
Siebert [44] 6 904 + 632 Tendon No significant differences Active laser treatment to the placebo group received red 632 nm LLLT, which we calculated to be (2.25J), which again is an adequate LLLT dose. Consequently this trials lacks a placebo or non-laser control group
  1. Trial characteristics given by first author, method score, laser wavelength, laser application technique, trial results and reason for exclusion.