Harry Potter star Robbie Coltrane was spotted for the first time in a wheelchair as he waits for surgery on his knee amid his ongoing battle with osteoarthritis.

Known as the friendly half-human half-giant Rubeus Hagrid in the Harry Potter saga, the actor promoted Hagrid's Magical Creatures Motorbike ride at Universal Orlando.

The actor, 68, was left unable to walk at the St Pancras Renaissance Hotel, in London on Monday after being in 'constant pain for years' with his knee.

Hagrid joined us last night at the @UniversalORL press event for Hagrid's Magical Creatures Motorbike Adventure - R to L: Robbie Coltrane, Art Director Alan Gilmore and Senior VP Universal Creative Thierry Coup. https://t.co/teTZGSmMoX pic.twitter.com/WLfMZ19Y1P — Blooloop (@Blooloop) March 12, 2019

A source told The Sun: 'Robbie has been in constant pain for years now, with his knee constantly deteriorating.

'It’s left him unable to walk without any assistance and he’s been given a wheelchair while he waits to have a special surgical procedure in America to repair his joint.

'It’s hugely frustrating for him but he’s really hoping to be back on his feet after getting the operation.'

Exciting: Known as the friendly half-human half-giant Rubeus Hagrid in the Harry Potter saga, the actor promoted Hagrid's Magical Creatures Motorbike ride at Universal Orlando

MailOnline has reached out to Robbie Coltrane's representatives for further comment.

Robbie has been in daily agony with osteoarthritis — a condition that makes the joints become painful and stiff, according to the NHS.

Three years ago, the actor revealed doctors told him to lose seven stone or risk facing life as a 'cripple'.

Revealed: The actor, 68, (pictured in March 2016, UK) was left unable to walk after being in 'constant pain for years' with his knee

In 2016, the Scottish native said of his health: 'I'm in constant pain all day.

'I had an exploratory operation and they discovered I had no cartilage left in one of my knees. It's completely disintegrated.'

In the 2016 Channel 4 television series National Treasure, Robbie was filmed using a walking cane when he starred as Paul Finchley.

Painful: Robbie (pictured in June 2014, Orlando) has been in daily agony with osteoarthritis — a condition that makes the joints become painful and stiff, according to the NHS