The full name of prp in Chinese is platelet-rich plasma, and the treatment of knee joint is usually injected once a month, and it needs to be injected three to five times in a row. prp can be used to treat mild or moderate osteoarthritis, usually three to five injections, once a month, under normal circumstances, the injection treatment can be seen after a week of efficacy. The main components of prp are platelets, white blood cells and fibronectin, which are extracted from the patient’s own blood, and after purification and concentration, the platelets contained in the plasma are injected into the joint cavity to promote cartilage repair and thus achieve the therapeutic effect. The effect of prp treatment on knee joints can generally be maintained for about a year, because the specific condition of the patient is different, so the maintenance time will also be different. If you feel unwell, you should go to the hospital in time to avoid delaying your condition.