The Nintendo Wii has been proved to be a danger to TVs and relatives if you accidentally let got of the Wiimote in mid game -but doctors in the UK think this Christmas is going to result in a sharp spike in Wii-related injuries.

The Wii might be getting gamers off the sofa and making them more active but all that activity could come at a price this Christmas, as the Wii tops Christmas shopping lists.

Doctors claim that those spending too long on the Wii – especially those unused to moving more than their thumbs when gaming – are at risk from strain. In fact, researchers at Leeds Teaching Hospital have already identified an injury they call "Wii knee". Bizarre, but true.

Dr Andrew Coley, a paediatrician at the Royal Shrewsbury Hospital, said playing the games for too long in the first flights of enthusiasm could lead to injury. He diagnosed one of his patients when he recognised an injury similar to that he had also sustained over-using his Wii.

"This patient had got a Wii for Christmas, hadn’t exercised in a while and overdid it. I hurt myself by trying to get an Ace on my serve in the tennis game."

Though this probably means that there is a market for a warm up/cool down  game for the Nintendo Wii