Low-energy density CO2 laser as deep tissue stimulator: a comparative study.

A series of experiments on 12 pigs to verify the tissue penetrating capacity of a LED CO2 laser have been conducted to confront its effects with those of a infrared (IR) diode laser. The tissue target was the external femoral condilus of the right hind limb knee. The right knee was taken as control. After a series of laser radiations with both lasers for up to 60 days it was verified that the LED CO2 laser, contrary to what has been reported by physicists, can produce very active tissue stimulation on deep tissues with significant results. The authors suggest that the definition of physical properties of lasers should be redesigned in order to better understand their biostimulating effects on tissues.