What Causes Pain In Knee And Swollen Ankles?

hi, doctor i have knee pain and swallowing at foot ankles and heel pain. doctor advised me for inj. terifrac 20 iu and hcqs 200 mg and various other medicines. i am no comfortable and wanted to know whether to take these medicines for rhumatiac airthrites and have been diagonised as retrocalcaneal burbitis and oa of knees grad iv? i need yr. advice please, thanks