I recently developed swollen legs - both -and extreme knee pain. Had ultra sound scan which showed cyst (bakers) behind the knee on first leg to swell.then the other leg became swollen. Doc puzzled because both legs! After 3/4 weeks decided only thing to try was steroids as i have pmr from 2011. My simple question is - can pmr affect knee ? Didt when i developed it in 2011. 2/3 weeks on the steroids are working !