I'm so sorry Cindy. My son has the exact same issue with his oldest Aussie(he's only 5 and has had the problem almost since he was one). He limps all the time. My son gives him glucosamine and it helps only slightly. The vet tells him to make him stay down--yea right!! Are you kidding, Mr. Vet? Believe me, my son is always upset about it. So far he hasn't had to have surgery but it could happen any day.
Also: My son started to take them to the groomers last year about every 3-4 months and get a close haircut. Not shaved but close. It has completely ended the 24/7 brushing, excessive vacuuming, allergies, etc. It's the best thing he's ever done. I'll ask if he has him on meds. I don't think he's giving him anything right now but he may have in the past.

Feel better Zoee!!!