The Canaries signed the 22-year-old from Barnsley in July on a four-year contract, even though he had not played since December 2011.
"With an injury like that, the mental side is the toughest bit, you get a lot of down days," said Butterfield.
"You feel like you're not getting anywhere and, signing for a new club, I was desperate to get over it as soon as possible and get on the pitch."
He added: "It's the first time I've experienced it [a serious injury].
"Signing for Norwich gave me a little boost in the summer; a bit of encouragement to keep working hard to get back fit.
"I'm glad I'm ready to go now because it seems like I've been here a lifetime, waiting for that chance."