The Efficacy of Botulinum Toxin vs. Corticosteroid for the Treatment of Refractory Plantar Fasciitis

20 units of Onabotulinum A in 200 µL of saline injected into the flexor digitorum brevis via ultrasound-guidance

1 mL of 4 mg/mL dexamethasone with 2 mL of 1% lidocaine OR 1 mL of 4 mg/mL dexamethasone, 1 mL of 2% lidocaine and 1 mL saline injected into the plantar fascia