Since you haven't seen any improvement yet I would suggest that you also find a veterinary chiropractor because I have seen better hip stimulation if the head of the femur is contacting the socket better. You could also feed a commercially prepared raw food diet and give additional vitamin C to bowel tolerance (which means giving a quantity just less than what would create soft stools). Gradually give a little more Vitamin C twice daily with meals until the stool is a little soft and then reduce the dose so that it is normal again. Keep reducing as you need to keep the stools normal.
Continue to use Arthro-IonX for a while longer yet and be sure to not let the product contact metal. Avoid metal bowls and measuring spoons. The product is charged and will become less effective if it contacts metal because it drains the charge.
We will look forward to your next progress report.