It was previously hypothesized that patients receiving Intense Therapeutic Ultrasound (ITU) in addition to the standard of care would have a more rapid resolution of pain, faster return to activities, and a decrease in intra- and perifascial lesions.

Intense Therapeutic Ultrasound (ITU) is an established ultrasound-based therapy in which sound waves are concentrated and focused into a well-defined specific area of musculoskeletal tissue. Previous researches hipothesize that the application of ITU improve and accelerate healing in patients with chronic plantar fasciitis.

Inclusion Criteria:

• Both sex patients.
• Plantar fasciitis diagnosis: pain during walking during the first steps in the morning; pain due to palpation of plantar fasciia insertion.
• Chronic pain of at least 6 month.
• Longitudinal thickness of the plantar fasciia more than 4 millimeters.
• No previous surgery in the plantar fasciia.
• No previous application of alternative treatments such us shock waves or injections (last ninety days)

Exclusion Criteria:

• Platelet count disorder or anticoagulation therapy.
• Anti-inflammatories usual treatment for the treatment of plantar fasciitis.
• Diabetic foot syndrome.
• Presence of metabolic disease such us: hypertension, hiper or hipothyroidism.
• Pregnancy or breastfeeding.
• Previous treatment with fluoroquinolones antibiotic.
• Bilateral plantar fasciitis.
• Diagnosed Autoimmune disesase.
• Morphofunctional disorders in the foot and ankle.
• Diagnosed fibromyalgia.
• Heel disestesy.

Patient located in experimental group will be treated with ITU. Patient located in control group will be treated with the same protocoll of ITU without intensity.