ZFT
There are a couple of threads going back some about hips and knees, try and look at them.
personally I have had both hips and a knee done by the same surgeon in Cambridge and his opinion
is that although gluco whatever can work in the short term bear in mind it's the cartlidge that is screwed, so bone on bone
can be sort of painful in the long run.
but whatever,it is a very subjective problem and all you can do is listen to all the sage advice and then make up your own mind as to which route you take but in the meantime have a look here.
Help for Hips and Knees
good luck
Clive R