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Hundreds of thousands of people surgery on their knees. A new study from Finland says many of these people might wasting their time and money. The surgeons who the study said some knee surgery can knee problems worse rather than better. The surgeons 10 years studying the results of knee operations. They that surgery on tears in the knee cartilage rarely worked. The doctors said many of the operations unnecessary. They added that some of the operations they at accelerated the rate of cartilage damage. One doctor said: "What has been dramatically is that patients who have this procedure more pain."

In happier knee-related news, doctors from the University of Colorado have a new method to chronic knee pain. Dr Leigh Casadaban has simple operations on people's knees. Her method reducing the flow of blood to pain-causing areas in the knee. Less blood in those areas swelling and pain. Dr Casadaban says her method is more effective than painkilling medicine and physical therapy. She also believes it people can knee surgery, even total knee replacements. She said her method could " years of relief" by pain inside the knee joint. She said 70 per cent of patients amazing results.