M.A.D. revisited

Remember my M.A.D. post???? Well it's been a couple of weeks since I've seen a specialist for my knee problems and I am still trying to process what he told me. I have Osteoarthritis; I have no cartilage in my right knee. The "cure" is total knee replacement!!! I can't dance right now...it's too painful. I've been in constant pain for almost 2 months now and over the counter medications don't work. I am going to try an injection treatment of a medication that will relieve the pain for 6 months, if it works. I am also going for a second opinion. I just can't make the decision to have surgery on just one opinion. I am scared. I am 51 and have never had any serious illness or injury, no major surgery, and this is major.