What happened to Grimes?

Sprots is full of hype and I get it's part of the off season, but wow, has a player ever been hyped so much and yet disappear so quickly. If he has an injury, let's hear exactly what it is and what is going on to fix it. There just seems to be quite a few question marks with this team this year. I don't expect Grimes to be the answer to all the Knicks issues, but it seems like he could help.