She has osteoarthritis changes in her knee joint so hyaluronic acid and stuff will slow the degenerative process of cartilage in joint but it vl not form newly. So along with dat precautions is the key , it's her age and bcz of that this degenerative changes is der so avoid sitting cross leg use chair , use western toilet , do knee exercises life style modification will help here else once u stop medicine again it vl start So start tab ETOVA 90 mg whnever pain is der but as I said precautions is the key