I have had several SI steroid injections for arthritis and inflammation and they work well. My relief always lasted several months to a year. I know I have a low pain threshold so always got anesthesia. You can always try one first without then decide if you want to change if you need more in future. Or if you’re like me, ask for anesthesia even though they’re not offering it. It’s easier for them without. I hope you get good results!