Russian squat routine is likely too much to fast if you are only now healthy.
I would train like most beginners train the squat (in Russia etc...) and do higher volume sets (5-8 reps) with moderate weight. This will help you regain hypertrophy, strengthen the tendons/ligaments and improve your work capacity again.
After several weeks of this sort of program then you should be ready to hit a harder program like the RSR if you still want to hit very heavy squats.
I have talked to a good 23 y/o lifter in Russia (hes not famous, but still does 160/200 in 94s) who said when he was young he would do squats with 80-90% of his clean and jerk for sets of 2,4,6,8,8,6,4,2 in his workouts. for the first year or so to help prevent injuries in the future and build work capacity.
He says that despite training around 12 time/week at good intensities he NEVER gets knee pain or any other lower body injury.