Odile, You are so great with sharing your information and there is much to consider. Beyond the amount of time you have suffered some of your symptoms and indicitive of an advancement in the condition. These issues are more complicated and require more careful speculation before you just set out on a program. So before I move forward, and now that I know how indepth you will be, allow me to ask a couple more questions. Any way you can send me a few pictures on the pm of the front of your thighs to your feet from the front and the side, to your hips would be even better in form fitted clothing? This would answer the issue of pronation and give me some ideas of your hip instability; and I assure you this is a part of the origin. Secondly. If you kneel on the floor and sit your buttocks on your heels; can you do it without pain and is the front of your ankle on the floor or is it all too difficult to straighten out your ankle, and where is the most discomfort? How soon after you added the heel cups did you see relief and do you wear them in all your shoes? Do you have an orthodic in your golf shoes? Would you say that your calves feel tight? You didn't mention any exercises you are doing from your therapy. I'd like to know what has been applied, what you've continued and avoid redundency. Often the effectiveness, or lack thereof, illuminates our process.
Cortisone is a great relief and notorious for loosing it's effectiveness over time. I am surprised you received such a short reprieve. It just further indicates that your only choice is to do the work of bringing your legs into conjuction to alleviate your ankle disorder. It is the only way to avoid an actual rupture. But you already knew that.
Look forward to reading more. Vickie
P.S. I promise I will get to some recommendations soon. It's always a little easier when I can see the whole body function and do some testing. I appreciate your patience.