Hip dysplasia in labs need advice from the experienced

Apologies for getting some of you aroused.
Yes, I have a vet.
Yes, He's been diagnosed with hip dysplasia.
Yes, we've been told to restrict movement and been told to try supplements.
Yes, we've tried/or on synflex, glucosamine and gelatin supplements with his meals.

I'm looking for advice from owner's of medium to large breed dogs who have had surgical intervention performed on their dogs and their recovery.

Thanks a bunch.