Effects of Autologous Blood Injection Versus Platelet Rich Plasma on Chronic Plantar Fasciitis

Inclusion Criteria: 1. Participants who were diagnosed with chronic plantar fasciitis 2. Nonresponded to o conservative treatment (stretching exercises, nonsteroidal anti-inflammatory drugs, and heel pads) for at least 6 weeks 3. Patient should be able to understand the informed consent about type of treatment and blindness and randomization 4. Visual analog scale pain higher than 5 (on a 10-point visual analog scale) Exclusion Criteria: 1. previous history of any type of local injection treatment for heel pain 2. history of surgery for heel pain, foot and ankle disorders, fractures 3. Associated pathology involving the lower limb such as * tarsal tunnel syndrome * effusion of the ankle indicating an intra-articular disease * Peroneal/Achilles/tibialis tendons pathology * any obvious deformity of foot and ankle, 4. Patients with systemic disorder like diabetes mellitus, ankylosing spondylitis rheumatoid arthritis, hematological disease, or gout 5. Pregnancy 6. Use of antiocoagulation -