Thousands of people have knee surgery. A new study says many surgeries might be a waste of money. Some knee surgery can make knee problems worse, not better. The researchers spent 10 years studying knee operations. They found that surgery on knee cartilage rarely worked. They added that some operations increased cartilage damage. One doctor said that patients who have this operation can "have more pain".

In happier knee news, doctors in the USA have found a new way to help long-term knee pain. One doctor has performed simple operations that lower the flow of blood to painful areas in the knee. This lowers swelling and pain. The doctor says her method is better than drugs and therapy. She also thinks people can avoid knee surgery. She said her method could "provide years of relief". She added that 70 per cent of patients have great results.