Homologus PRP in the Infiltrative Treatment of Knee Osteoarthritis in Young Athletic Patients

The study consists of 3 phases (enrollment, infiltrative procedure, and controls): * Identification by specialized orthopedic medical staff belonging to the SC Orthopedic and Trauma Clinic II of the Rizzoli Orthopedic Institute of subjects who meet the study inclusion criteria. Signing of informed consent form and completion of evaluation questionnaires. * infiltrative procedure * Patients will be clinically evaluated before the infiltration procedure and at 1, 3, 6, and 12 months after treatment by trained medical personnel (outcome assessors). Questionnaires will be administered for clinical evaluations before treatment and at these clinical checkups during follow-up. Any adverse events to treatment will also be assessed during follow-up visits. The duration and extent of joint swelling and pain following infiltration will be reported, and any drug therapies taken by the patient will be recorded.