The Effect of Low Level Laser Therapy on Pain and Range of Motion of Patients With Knee Osteoarthritis

Abstract

Purpose: Osteoarthritis is one the most common chronic diseases of the joints that mostly affects knee joint. Low power laser is one the minimally invasive treatments of osteoarthritis. However, the efficacy of this therapy is still controversial. This study aimed to evaluate the efficacy of low power laser therapy in reducing pain and increasing knee range of motion compared to placebo laser. Methods:This study was a double-blind clinical trial performed at a day clinic in Tehran, Iran, from March 2016 to February 2017. Treatment for both groups comprised 10 sessions, 5 times a week. In this study, low power laser with a wavelength of 810 nm and a power of 100 mW at 8 points was applied around the knee during two weeks of treatment. At the same time, laser was applied in the placebo group, but the power output was zero. Data analyses were performed by repeated measures ANOVA test using SPSS version 20. Results:The mean pain score at rest (P=0.691), as well as at activity (P=0.751) were not significantly different between the two groups. The range of motion of knee flexion (P=0.435), and the range of motion of knee extension (P=0.885) showed no significant difference between two groups. Both interventions over time lead to a significant change in pain at rest and at activity and also increase in the range of motion in knee flexion and extension (P<0.05). Conclusion:Both placebo treatment with routine physiotherapy and active laser therapy with routine physiotherapy decreased knee pain and increased knee range of motion in patients affected with osteoarthritis and there was no significant difference between two therapies.

Comparison of Physical Therapy and Orthosis on Clinical Outcomes in Patients with Medial Knee Osteoarthritis

“…The present study aimed to compare two common conservative treatments (orthosis and physical therapy) on pain and function in individuals with knee OA. Orthoses and physical therapy are the most common conservative managements of knee OA that are effective in reducing pain and improving function 13,18 . Comparing the two interventions in the present study, the results demonstrated that the orthosis group (using both knee brace and LWLs) had better results for pain score related to VAS than the physical therapy group immediately after and 6 weeks of using the intervention, with a significant difference between the two groups.…”

“…Orthoses and physical therapy are the most common conservative managements of knee OA that are effective in reducing pain and improving function. 13,18 Comparing the two interventions in the present study, the results demonstrated that the orthosis group (using both knee brace and LWLs) had better results for pain score related to VAS than the physical therapy group immediately after and 6 weeks of using the intervention, with a significant difference between the two groups. A recent systematic review stated that, because lower-limb joints are linked as a closed chain, ankle and knee joints are considered as an integral unit in the human body.…”

Guidelines versus evidence: what we can learn from the Australian guideline for low-level laser therapy in knee osteoarthritis? A narrative review

“…To date, we have located a total of twenty-five studies of LLLT for KOA or knee pain, seventeen of which were not cited in the Guideline though were available up to 2018 [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. One study has not been considered as it was a study using laser acupuncture, though had been included in several of the systematic reviews [36].…”

“…Of these, there were seven double-blind randomised studies comparing LLLT with placebo (sham laser) [19][20][21][22][23][24]35]. Of these seven studies, five demonstrated both clinically and statistically significant results favouring LLLT.…”