Effects of low-level laser therapy on inflammatory symptoms in an arthritis rat model.
Seima Okita, Ryo Sasaki, Yasutaka Kondo and 3 others
PMID 36628144WHAT IT FOUND
In rats with induced arthritis, seven days of low-level laser therapy reduced knee swelling and pain sensitivity compared to untreated arthritis.
This animal study does not provide evidence for human treatment, but suggests laser therapy may help limit acute inflammatory pain and hyperalgesia.
Key findings
01Laser-treated rats had significantly less knee swelling and higher pain thresholds than untreated arthritic rats at seven days.
02Laser therapy prevented the drop in paw withdrawal threshold seen in untreated arthritic rats, indicating reduced secondary hyperalgesia.
03Pathological examination showed mild synovial cell infiltration in laser-treated rats, whereas untreated arthritic rats had marked infiltration.
STILL TO COME
How it was doneWhat they found
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What it does not show
This is an animal study using rats, so results cannot be directly applied to human patients. The study did not measure inflammatory cytokines or biomarkers to confirm the mechanism of action. The sample size was small, with only six rats per group. The arthritis model was chemically induced, which may not replicate the progression of human osteoarthritis or rheumatoid arthritis.
Declared interests
The authors declare no conflicts of interest.
The easy way to misread this
Do not interpret these results as evidence that low-level laser therapy is effective for arthritis pain in humans. The study was conducted in rats with chemically induced acute inflammation, and no human outcomes were measured.