both knee are missing about half of cartl.my knees hurt.I went scoi and after xrays was told i needed knee replacement which my insurrance covers.but was told that i was not a good canidate because of my weight and possible bad circulation.I weigh about 295 and doc says I have be under 285.he gave me cordozon shot did not help one bit,then something with 2 siringe shots in each knee did not work.that stuff suppose to work in on month its going 3 months,still hurts