Osteoarthritis? Sudden loss of muscle. Hard to get up stairs.. etc. Very active and have been treated for arthritis for 15 yrs after retiring from riding pro rodeo. 54 yrs old, female, and still very active. Just want to know if I could have some kind of vitamin deficiency?

It could be both or neither but a simple check up with a blood test would certainly answer your question.

What feels like sudden loss of muscle can be your heart having difficulty pumping blood to what may be perfectly good muscles. SEE A DOCTOR!

Muscle weakness is associated with osteoarthritis, which is genetic; bone loss in the joints effecting muscle structure and performance. There isn't very much of a cure, but see your doctor so he can explain your options for long term care where you will be more comfortable.

No, it isn't a vitamin defficiency and if you know what your condition is called, then your doctor has already diagnosed you. Have you had bone density tests? That is a good place to start.