I think Cartrophen injections would work well. However, I would start Arthro-IonX a week before beginning Cartrophen to prepare the body. It should improve utilization and aid cartilage regeneration.
I would continue to give injections according to schedule until you arrive at a comfortable status.
Hopefully, using Arthro-IonX will help you to get improvement faster and thus reduce the number of injections. If it is possible for you to give digestive enzymes with meals, probiotics daily, and a high quality fish oil daily, these will be synergistic to the above treatment.