Introduction: Tendinopathy is a common musculoskeletal problem. It is estimated that 30-50% of all sports injury is caused by tendinopathy. Even with the high prevalence, treatment option for tendinopathy is still limited. Platelet Rich Plasma (PRP) is said to be able to repair ligaments, regenerate muscles, and repair cartilage. This paper aims to describe the impact of PRP injection on the function of the extremity. Methods: Patients with tendinopathy who were injected with PRP at Sports Clinic Soetomo General Hospital between October-December 2018 were included as samples. The VAS, SF36, DASH, and KOOS scores from each patient before and after injection were recorded. Results: Data from four patients with tendinopathy were collected. The samples were aged 23.5 ±5.6 years old, 75% (n=3) were women, and all have had tendinopathy for more than six months. All patient has had chief complaint of pain at the location of tendinopathy. Average VAS before and after injection were, respectively, 7±1.2 and 2±0.82. Time to functional improvement for 75% of patient are between 5-10 days and 25% within 10-15 days. Conclusion: PRP injection is found to reduce pain and improve functional outcome of patients with tendinopathy. This result can be used as a basis for further research.