Nunchuck Leg
When a tibia and fibula both break and the person takes weight off that leg and the lower section of the leg swings like a nunchuck they have suffered what can only be medically described as 'Nunchuck Leg'
Connor McGregor went to take a step back, as he takes weight off his leg it's obviously broken by the way it swings like a nunchuck - he has suffered Nunchuck Leg