After 20 yrs of tenderness and pain in both knees that have both stumped sports doctors and severely limited my activities, I am now diagnosed with synovitis and scheduled for surgery. The pain has always been a burning and stinging sensation just below the kneecaps. Has anyone else with synovitis had similar symptoms? I was also wondering what sort of improvement I might expect following arthoscopic surgery. It would be wonderful to ride a bike again. Thanks for the help.