O/T Sports have worn down my knees, can it be reversed possibly???

So I know this is definitely off-topic, but I consider people in this forum to be very smart and helpful. Basically it is common for athletes to wear down their knees. I need to play sports either on hardwood or on grass and even still have painful knees and can't do the training Id like to. Is there any way I can reverse this?

Thanks!!!!!! This would mean everything to me. Tweet