Knee osteoarthritis sufferers shun exercise even if they are told it can diminish the pain and stiffness caused by the condition. That’s according to doctors at the University of South Australia, who found people – despite them knowing the opposite to be true – to “unconsciously believe” they could further damage a gammy knee if they exercise on it. “While physical activity is known to ease symptoms, only one in 10 people regularly exercise,” the researchers said, finding some to deem exercise as “dangerous” even if they have been given medical advice to the contrary. “Research shows that phys…