What Causes Pain On The Shoulder With Knots On The Wrist?

yes my Husband has been Diagnose with Rheumatoid arthritis. They have had him on . mg of Methotrexate. He has been taken it for approx. 3 years. When all this starting happening My Husband was put in the hospital. He had a line going up his arm from a wound. well they ended up doing surgery before they got the line gone then he got gang green while there come to find out they were giving him the wrong antibiotic. When they gave him the right stuff the wound started to heal. But approx months later he started getting pain in his shoulder then wrist. a year later he started getting notts on his wrist. Anyway he has had this for some time know but yet the state says he not disable and his doctor says he is. He has no arthritis any where else. I believe he has a bone infection. But no Doctor will listen to me because its the same Hospital that he is treated at that he was in for the infection. I just want him better diagnosed because there are questions they can not answer for me.