UGG boots - the cosy footwear beloved by celebs - could be causing women serious knee injuries, warns a top surgeon.

The comfy shoes don't offer enough support, says Ian McDermott, and could cause "knock-kneed" stance.

2 A top surgeon has said soft boots, like Uggs, could cause knee problems Credit: Rex Features

He said he did not specifically have a gripe with Ugg boots, but with any soft boot - due to the lack of support.

The expert said this style of boot can lead to a bad posture, knee pain and even back pain, which could need surgery to tackle.

Mr McDermott, a knee surgeon in London, said: “This is a bit of a ‘red flag’ and a sign that it’s potentially worth investigating the knee with X-rays and an MRI scan to check exactly what is going on inside the joint.

“The longer these things are left, the worse the damage can become, and the harder it can then be to fix.

2 The boots have been a hit with celebs, with the likes of Beyonce donning a pair Credit: Getty Images - Getty

“Sheepskin boots and high heels may look great, but vanity may come at the cost of potential physical damage to your body.

“Unsculpted and flimsy footwear can mean that your feet aren’t fixed in one location as you walk, meaning that the lower limb is working harder, with a greater risk of damage.

“Listen to your body and make sure to not wear flimsy boots every day."

He added: “If someone born with an inherently poor structure or with poor alignment then wears a poorly supported pair of shoes or boots, this can exacerbate the whole issue and this can then end up being the final straw that pushes them into developing symptoms and actual orthopaedic problems."

An Ugg spokesman said: "UGG is the leader in premium sheepskin footwear. The UGG Classic boot provides the full experience of warmth, comfort and flexibility.

"The Classic II is lighter weight for increased wearability and offers added innovative enhancements, such as Treadlite by UGG outsole technology for increased traction, durability, and cushioning.

"As with any shoe, we encourage customers to ensure the proper fit for maximum comfort."

Last year we reported on a new summer-ready Ugg which was a "striking mashup of two icons".

Primark's gold sparkly Minnie Mouse heels have finally hit stores... but there's a catch

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