I found out I have arthritis between the talus and heel bone, I'm going to get subtalar steroid injections by imaging, what should I expect?

A shot under x-ray. Your doctor will use x-ray imaging to help guide the needle into the subtalar joint. With arthritis, getting the needle into the right space can be hard otherwise. The injection will sting a few seconds, and will hopefully provide some pain relief. With arthritis, injections only provide pain relief for a period of time, but the relief may be acceptable to you.