you should mention it clearly about what surgery you had for what.
but it seems you had a type of arthritis
your question is about cartigen
its a new drug.
it contains chondroitin sulfate,glucosamine
these are the chemicals present in joint fluid.
so it seems it will help in replacing that.
but clearcut evidence is lacking.
though from personal experience i can say some benefits are there.
it is being prescribed in good amount now a days.
so dont worry you can take them.
hope it will help.