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Low power Ga-Al-As laser treatment of painful osteoarthritis of the knee . A double-blind placebo-controlled study . The aim of this double-blind study was to evaluate the effect of low power Ga-Al-As laser treatment on chronic pain related to osteoarthritis of the knee with periarticular tender points . Twenty-nine out-patients with uni- or bilateral osteoarthritis of the knee were included and randomly assigned to treatment with either laser or placebo laser . Fourteen patients received active laser treatment and all patients included completed the study . The effect variables were daily levels of pain , analgesic requirements , palpation tenderness and isokinetic quadriceps strength . Each patient participated in the study for 9 weeks and registered daily level of pain and consumption of analgesics . In weeks 4 , 5 and 6 the patients received a total of nine treatments , each of 15 min and administered to periarticular tender points . The dose per treatment was 22.5 joule . No significant differences in any of the effect variables were found between the two groups before , during or after treatment . With regard to the patients ' overall assessment there was a clearly demonstrable positive effect of treatment in both groups . This is likely to be due to a placebo effect .
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Intervention_Physical
Ga-Al-As laser treatment
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Intervention_Control
placebo-controlled
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Intervention_Physical
low power Ga-Al-As laser treatment
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Intervention_Physical
laser
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Intervention_Control
placebo laser
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Intervention_Physical
laser treatment
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Intervention_Control
placebo
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Outcome_Pain
painful osteoarthritis
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Outcome_Pain
chronic pain
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Outcome_Physical
daily levels of pain ,
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Outcome_Pain
analgesic requirements
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Outcome_Physical
, palpation tenderness and isokinetic quadriceps strength
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Outcome_Pain
daily level of pain
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Outcome_Physical
consumption of analgesics