Inclusion criteria:  Age 18-75 years. Diagnosis plantar fasciitis verified clinically by orthopaedic surgeon. Diagnosis verified by MRI. MRI criteria: Thickening of the plantar fascia, oedema in the calcaneus, pathological singal changes in the plantar fascia (37) Duration of symptoms must be at least 12 months. An isolated gastrocnemius contracture must be verified with the Silverskiölds test before inclusion. Conventional Physical Therapy must have been tried at least three months without positive effects on symptoms from affected foot.  Exclusion criteria:  Previously undergone surgery for plantar fasciitis. Patients with severe talocrural pathology or serious malalignment of foot and ankle Severely reduced peripheral circulation or chronic ulcerations of the foot History of alcoholism, drug abuse, psychological or other emotional problems likely to jeopardize informed consent. Patients with a contraindication/non-compliance for MRI examination. Unable to walk without aid. Not able to read and/or speak a Scandinavian language or English adequately.