In book 2 how many bones does Harry Potter have to grow back?

In Harry Potter and the Chamber of Secrets, Harry does not have to grow back any bones. He does, however, get his arm broken by a rogue Bludger during a Quidditch match.

It's important to note that Harry's bones don't actually *grow back* like some magical healing might suggest. The injuries are treated by Madam Malkin, the dressmaker, using a special potion.