given that I've just undergone surgery for mine, i feel his pain, and his fire. he will be back and he will be better, but it will take time.
i am also surprised it has taken this long to happen. wake boarding seems to be a fairly injury light sport in some respects, until of course water grabs your board incorrectly and you grenade your knee or end up with a concussion. these boosted wakes aren't helpful either.
i wonder if cable knee injuries are less prevalent? lower speeds etc...