The Brit star plays a grumpy medical genius in the series and the character uses a cane to walk.
But the fake limp has caused Laurie some real problems - and he wouldn't rule out leaving the show in a bid to regain full health.
He says, "The show might last through to series seven, eight or nine but I don’t know if I will because I’m starting to lose my knees. It’s a lot of hip work. There are things going badly wrong. I need to do yoga."