I Am 84 And Underwent A Hip Replacememt Three Months

I am 84 and underwent a hip replacememt three months ago. the knee on the same leg as the hip replacement is giving me considerable pain. My doctor ha given me three injections of monositz but with little if any improvement. due you have any thoughts about a knee replacement or stem cell treatment. I had cartaliage removed from that knee in 1954. I am currently taking celebrex which helps.