A 60-year-old male patient, who works as a construction worker, complains of pain in the right hip and knee joints, that is getting worse on exertion. These presentations have been observed for the last 5 years. Objectively: the patient is overnourished. Right knee joint is moderately deformed. Examination of other organs and systems revealed no pathology. Blood tet results: WBCs -8, 2 × 109/l, eSr -15 mm/h. Uric acid - 0,35 mmol/l. What is the most likely diagnosis?