Table 2

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

Study by first author

Method score


Application technique


Reason for exclusion

Haker [43]




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]


904 + 632


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

Trial characteristics given by first author, method score, laser wavelength, laser application technique, trial results and reason for exclusion.

Bjordal et al. BMC Musculoskeletal Disorders 2008 9:75   doi:10.1186/1471-2474-9-75

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