Physical therapy is often a very successful tool in the treatment of patellar tendinopathy and should be followed and implemented for at least 3 to 6 months as a first line of treatment. For those individuals suffering from recalcitrant patellar tendinopathy that have failed more conservative treatments, it may be worthwhile to include PRP injection therapy as a recommendation. Studies have shown decreases in tendon irregularities and results of pain reduction and/or increased function after PRP injection. Although current research is of lower quality and confers no clear benefit that can be stated with certainty, we can say PRP injection is a very safe and minimally invasive procedure that almost always provided patients with some sort of pain reduction and allowed many of the subjects to return to sport and play to full capacity. Further high quality research is needed in this area.
Mesch, Shyla. "The Effects of Platelet-Rich Plasma Injections on Patellar Tendinopathy." UNM Orthopaedic Research Journal 2, 1 (2013). https://digitalrepository.unm.edu/unm_jor/vol2/iss1/18