My father,87 years, in the past two weeks has been having severe leg pain in both legs. He has fallen three times, and is trying to get around with a cane now. He looks like his knees won t straighten when he stands, but no swelling. He had blood work done last week, but it was negative.
Cannot really say without an exam. Various possibilities (none of which would show on blood work) include a severe lumbar disk disease or severe circulatory problem. An imaging study such as an MRI would be helpful BUT frankly a simple exam can show if there is good blood flow and where the pain is coming from.