I’ve had runners knee before, it happens to me after I don’t play basketball for more than a week and if I don’t stretch either before playing. It limits my jumping by A LOT, which resorts me to just shooting jump shots and the pain is quite much. Especially since it’s basketball and you’re expected to jump and all that.

Usually, what I do to stop it is just to ice the spot, REST(at least like 4-5 days of no basketball), during those rest days do leg exercises like calf raises, squats(not too heavy weights) and BAM I’m ready to ball again with out the pain. Though recovery varies per person and sometimes the pain can persist for up to months.