It has been just over a year for mine now. The whole nail came in at the bottom but after about an 1/8 or so of the way the middle stopped growing and still hasnt. I broke a bone which popped the nail up and the doctor removed the nail telling me it would grow back normal. There seems to be a scar of sorts in the middle of the nail underneath so I assume that is damaged or something and that is why it is not growing. I am still hoping it will but after a year it's hard to be optimistic anymore. So the sides grow in towards the middle since there is nothing to push them out to the natural way of growing. I wonder if there are fake nail alternatives or something? I know it could be worse but the appearance of it really bothers me.
Here are a couple of updated pictures: http://i45.tinypic.com/20ra5vb.jpg