Health experts: Fake Ugg boots are 'crippling' young women

Dr Ian Drysdale, head of the British College of Osteopathic Medicine, said: "Because these boots are warm and soft, young girls think they are giving their feet a break. In fact, they are literally breaking their feet.

Their feet are sliding around inside. With each step, the force falls towards the inside of the foot and the feet splay. This flattens the arch and makes it drop.

The result can be significant problems with the foot, the ankle, and, ultimately, the hip."

Another health professional, consultant podiatric surgeon Mike O'Neill has called the trend for cheap Uggs "disastrous".

He said: "As the foot slides around, you get wear and tear on the joints on the inside of the foot. The ankle is in the wrong position, the thigh bone also changes position, and you get an abnormal movement in the pelvis, which leads to back problems."

Experts warn that as little as six months of persistent use is enough to cause wear and tear damage that can be difficult to repair.

Dr Drysdale is especially concerned that the fake children's Uggs might damage, whose feet are still forming. He warned: "The damage and discomfort for kids is going to be heartbreaking."