Evaluating the Safety and Effect of abobotulinumtoxinA in the Gastrocnemius Muscle to Improve Equinus and Plantar Fasciitis Pain

Inclusion Criteria: 1. At least 18 years old and not older than 75 years. 2. History of Plantar fasciitis for a minimum of 6 weeks 3. History and physical examination consistent with plantar fasciitis and a diagnostic ultrasound study showing thickening of the plantar fascia \>5 mm (normal is 3 mm) 4. Minimum Visual Analog Scale (VAS) score of 4. 5. Failed conservative care with at least two of the following treatments: Stretching, rest, shoe modifications, insoles or orthotics, physical therapy, or cortisone injection. 6. Females of childbearing potential must be willing to use acceptable methods of contraception (birth control pills, barriers or abstinence) during the course of the study and undergo pregnancy tests. 7. Subject understands and is willing to participate in the clinical study and can comply with visit and post -injection questionnaire schedules. Exclusion Criteria: 1. Patients with history of diabetes, back issues, nerve issues or previous surgery of the foot or calf. 2. Patients with no pain in the heel region. 3. Subject is pregnant or breast- feeding.