Sorry to take up your time but im worried about my Dad.Heres whats happening.He is 85 and has Ruehmatoid Arthritis and been taking Methrotrexate for over 10 years.My parents got aletter about Methrotrexate not being covered by INS anymore? so he was off his meds for almost 3 months.He started limping and complaining about his knee and thigh hurting.They are very stubborn and finally he got so bad he could barely walk they let me call 911 and we went to the ER.We were there for 8 hours and all tests came back fine.Blood work,knee x ray,hip x ray and EKG..They started him on Prednisone at hospital and we went to his RA DR the following week who got him back on Methrotrexate and continuing with the Pred..He also prescribed PT To come to the house.My concern is he lost so much weight and muscle over 3 months hes just so week..His arms and legs have all atrophied at once,but his right leg is very week.Needs a walker to get around..He cant lift his right leg off the bed when lying down but his feet move strong.Both of his feet have lots of strength when I tell him to move them up and down and and I give him resistence...Lots of power to move against me..Im wondering if this could be ALS or some kind of back issue? The RA DR said the meds will take 6 to 12 weeks to start working again and its been less than 5 weeks..Still has lots of pain in knee and thigh...Its just scaring me how weak his right leg is...He has no trouble breathing,can move both his arms and his grip is very strong in both hands...He can chew and drink without choking...We never had his back x rayed because he has no pain in his back? With his legs so atrophied and week would he still have strength in his feet if he had ALS? Also he has never complained about any muscle twitching..He goes back to his RA DR in a week...I would love to know whats going on with him? THX