I'm still waiting to hear exactly why this injury is keeping DRose out for the season. If anyone hears, please post.
Because he had surgery to fully both repair and reattach his meniscus. If he had gone for a simple reattachment, he'd be back in eight weeks, but his knee would have been blown out again in a year or two. This was a procedure to both repair the cartilage tear and ensure that it's properly working within the joint.