I had PRP injections for my knees several months ago, with great results. I had activity limiting left knee pain for 1.5 years, and I was in a ballroom dance program. Gradually, eventually, I could even jog again. I recently ran the Aggie Stadium Bleachers, at the 911 Firefighter memorial event of 2000 steps. We did 5 laps around the stadium up and down the stairs. I finished; Minimal symptoms. I will get another injection if I need one.