Can trauma to a cortisone injection site stop it from working?

[meganmac]

I am not very knowledgeable about any of this so please bear with me, I have been told I have a Haglund triad in my left foot. Physio provided no relief and I could not take mobic due to Side effects and the Panadol osteo was doing nothing to help. I ended up seeing a specialist who has just given me a cortisone injection, I'm not even sure if this was for the bursitis or the severe insertional Achilles tendinopathy. The needlestick appears to be into the Achilles tendon. I had 2 nights off work then on my first night back managed to run up the back of my own foot with a roll cage.(forehead slap!)  and gave myself a fairly decent gouge/scratch right across the needlestick site. 5 days on from this and my ankle and heel are still so painful and I'm wondering if by hurting my heel that night it has somehow stopped the cortisone injection from working? I've never had one before so don't really know what to expect. Any advice would be greatly appreciated