Biological treatments — PRP (platelet-rich plasma), hyaluronic acid and stem cell therapies — aim to support the body's own healing mechanisms. They are used particularly in early cartilage damage and chronic tendon problems to reduce pain and improve function. It is important to be realistic about them: they do not regenerate damaged cartilage, their effect is not permanent, and the response varies between patients. Research into the long-term effectiveness of stem cell therapies is ongoing.