PRP Versus HA IN OSTEOARTHRITIS OF THE PATELLOFEMORAL JOINT

Inclusion Criteria: 1. Age between 30 and 65; 2. Signs and symptoms of isolated patellofemoral osteoarthritis present in one or both knees; 3. Radiographic signs of isolated patellofemoral osteoarthritis (according to Iwano et al stage 1-3 classification) or chondropathy (assessed on MRI) with K-L grade of the other compartments ≤ 2. \[PMID: 2302884 - PMID: 27979409\] ; 4. Hemoglobin \> 11 g/dl; Platelet count \> 150,000 plt/mm3 (Recently performed CBC exam); 5. No clinically significant electrocardiographic alterations (Recently performed ECG). 6. Ability and consent of patients to actively participate in clinical follow-up; 7. Signature of informed consent. Exclusion Criteria: 1. Patients unable to express consent; 2. Patients who have undergone intra-articular infiltration of another substance within the previous 6 months; 3. Patients undergoing knee surgery within the previous 12 months; 4. Patients with malignant neoplasms; 5. Patients with rheumatic diseases; 6. Patients with diabetes; 7. Patients with hematologic diseases (coagulopathies); 8. Patients on anticoagulant-antiaggregant therapy; 9. Patients with thyroid metabolic disorders; 10. Patients abusing alcoholic beverages, drugs or medications; 11. Body Mass Index \> 35; 12. Patients who have taken NSAIDs in the 3 days prior to blood draw; 13. Patients with cardiovascular disease for which a 60 mL blood draw would be contraindicated; 14. Patients with a recently performed blood test with Hb\< 11 g/dl and Platelets \< 150,000 plt/mm3. 15. Previous treatment of patellar dislocation 16. Iwano score of grade 4.