I only had one injection (treatment) in the right knee.
I took a few days off until the post-injection spongy/inflated feeling went away in my knee; and an another day or two off of squats and deadlifts. No issues at all related to the injection as I continued training.
I did not get any more injections; treatment did not help with my symptoms or pain management. The arthritis and torn meniscus are still there....
At the time, the Ortho told me that if lifting weights didn't aggravate my symptoms or cause additional pain I could go ahead and continue lifting; but he was not happy with the amount of weight I was squatting (at the time) and wanted me to cut back on the poundage--other than the few days off, I ignored his advice.
I'm an Engineer, not a Doctor. Your results may vary...
Good Luck!