 Background Tendinopathy is a difficult problem to manage and can result in significant patient morbidity. Currently, the clinical use of PRP in painful tendons is widespread but its efficacy remains controversial. Current experimental research postulates different efficiency among PRP formulations.Recent reviews showed that most clinical studies in tendinopathies have been performed with L-PRP. The investigators aim to examine the efficacy of pure-PRP in the management of epicondylitis. 