Comparison of the Effect of Ultrasound-Guided Injection of Botulinum Toxin Type A and Corticosteroid in the Treatment of Chronic Plantar Fasciitis: A Randomized Controlled Trial.

[OBJECTIVE] The aim of the study was to compare the efficacy of ultrasound-guided injection of botulinum toxin type A with corticosteroid in patients with chronic plantar fasciitis (PF).

[DESIGN] This randomized controlled trial was conducted on 35 patients with chronic plantar fasciitis. Participants were randomly allocated into two groups: one group received methylprednisolone in to the plantar fascia ( n = 18) and the other group received botulinum toxin type A injection into the flexor digitorum brevis and quadratus plantae ( n = 17). All injections were performed under ultrasound guidance. Patients were evaluated using the Visual Analog Scale, Foot and Ankle Ability Measures, and plantar fascia thickness before the intervention, 3 wks, 12 wks, and 6 mos after the treatment.

[RESULTS] In both groups, patients' pain and function improved significantly up to 3 wks after injection. In the botulinum toxin type A group, morning Visual Analog Scale improved significantly at 12 wks after intervention and the improvement was sustained for another 3 mos. In the botulinum toxin type A group, Foot and Ankle Ability Measures-sports subscale improved in all evaluated points, whereas in the corticosteroid group, the improvement was significant only when comparing follow-ups values to baseline.

[CONCLUSIONS] Both ultrasound-guided botulinum toxin type A and corticosteroid injection were effective in the treatment of plantar fasciitis. Our study showed that the effects of botulinum toxin type A injection last longer than those of steroid injection.