Doctors Advice…. Knee Replacement Help??????!!!!!!!!!!!?????????…

i am a 38 year old female… MRI report shows
Chondromalacia patella
medial meniscal degeneration
Can someone tell me if this qualifies for a knee replacement? I am in so much pain every day.
If i do qualify what is the best method of knee replacement to use? or should i wait until things improve.
I tried cortizone shots, physical theropy and several medications and nothing helps