Objectives: evaluation effectiveness of high energy radial extra corporal shock wave therapy (ESWT) in the treatment of chronic plantar fasciitis and comparing it with local injection of corticosteroid. Design: 40 patients with complaint of heel pain for more than 2 months and diagnosis of chronic plantar fasciitis during one-year are selected. Setting and conduct: The eligible patients will be divided to 2 groups of 20 , A & B, via closed envelops method. Inclusion criteria: patients with heel pain for more than 2 months. Exclusion criteria: 1. History of systemic inflammatory diseases, 2. Infective or malignant diseases, 3. History of direct trauma with or without foot bones fracture, 4. Previous physiotherapy in the past 3 months or local steroid injection in the past 6 months, 5. Heel pain related to Achilles bursitis, 6. Presence of myofascial pain syndrome and trigger points in gastrocnemius muscle, 7. Active S1 radiculopathy. Interventions: In group A (shockwave therapy), high energy radial ESWT with energy flux intensity of 0.25 mj /mm2, 2000 impulse, 10 Hz frequency, for 5 sessions twice a week will be applied. In group B, local injection of 40 mg Triamcinolone to tender point of heel will be done only one session. Moreover, therapeutic foot insoles will be prescribed in both groups and stretching exercises for medial fascia as well as gastrocnemius muscles will be educated. Main outcome measurements: Evaluation of pain intensity is done using visual analogue scale, so that patients must have at least 20 mm pain score. Assessment of foot function will be done using foot function index. Third variable is satisfaction of treatment at the end of intervention by satisfaction rating scale. These variables will be assessed at baseline, weeks 4 and 8 after treatment and finally will be analyzed and compared between groups statistically.