Should I have serial injections for sinus tarsi syndrome Doc On The Run Podcast

I saw a runner today and I did a cortisone injection to treat her sinus tarsi syndrome.  She asked me a great question. 
She said, “Is the cortizone injection something I am going to need to do every three to six months?”
She had been reading up on corticosteroid injections and had found that some athletes with certain conditions may have injections scheduled every few months.
Should I have serial injections for sinus tarsi syndrome? 
Well, that is a great question and that is what we are talking about today on the Doc On The Run Podcast.