Background: Plantar fasciitis accounts for 11 to 15 percent of foot pain in adults. Although an injection of corticosteroids is a common treatment in plantar fasciitis, it has side effects and short-term pain relief. Therefore, this study aimed to compare the effect of low-power laser therapy (LPLT) with methylprednisolone injection in unilateral plantar fasciitis patients.

Materials and Methods: In this clinical trial study, 40 patients with unilateral plantar fasciitis were randomly allocated into two groups (n=20). In the first group, 40 mg of prednisolone was locally injected and the second group received LPLT in 10 sessions. Levels of pain and morning stiffness were evaluated.

Results: Forty-two percent of cases were male and 57.5% female. Fifty-five percent of the patients had right and 45% had left foot fasciitis. The mean age of the patients was 52.98 years and the disease duration was 32.38 weeks. In men pain was seen more in the right foot and in women in left foot. Duration of pain in women with plantar fasciitis was more than the men. The effect of the two therapies on morning stiffness and pain reduction was the same in both groups. Moreover, pain reduction measured by visual analogue scale had a similar effect during the study in both groups.

Conclusion: LPLT like corticosteroid injection has significant effect on the intensity and duration of pain and morning stiffness in plantar fasciitis and can be used as an alternative to corticosteroid injection.