My buddy Scott crashed hard while kiting and landed on his surfboard with his right knee. We had to carry him out of the water and help him move around for the first few days. He’s now able to hobble on his own and will be seeing a knee surgeon when he gets back home.
You don’t appreciate how amazing your knees are until they don’t work correctly. Than you realize that you aren’t going anywhere fast without a healthy knee. So take care of them!