Welcome at HCM.
In a case of operated post traumatic ankle there are chances of having post traumatic arthritis
.You should do following to have relief-
-If you are gaining weigh then reduce it.Keep your self in normal weight range.
-Wear ankle supports .These are available OTC.
-Take some supplements like glucosamine(750 mg twice a day) & chondroitin(200-400mg twice a day).
-Apply warm pack over the ankle for at least thrice a day for 3-5 minutes.
Hope this will help you.
With best wishes.