Botulinum toxin type A in chronic plantar fasciitis: clinical effects one year after injection.

Objective: To determine whether the efficacy of botulinum toxin type A in chronic plantar fasciitis was maintained for more than six months after treatment.

Design: Observational follow-up study.

Subjects: Twenty-four patients who received botulinum toxin type A injection in a previous randomized study of chronic plantar fasciitis (active treatment group) and who presented a benefit one month after treatment.