His wife Penny Lancaster shared a snap of the rockstar recovering on his 75th birthday earlier this month.
In view of her 93,000 Instagram followers, the former model posted a picture of Rod in a bathrobe standing next to a birthday balloon and some cake.
She captioned the snap: “Roddy is doing remarkably well after his knee replacement surgery on Tuesday (so well that the naughty boy keeps trying to walk with out his crutches).
“Luckily he is being discharged today to celebrate his 75th tonight and home this weekend to see the boys play football!”(sic)
source: express.co.uk