Have You Seen Lady Gaga's Shoes??
As you can see from her colorful outfit (well, kinda black really) topped off by shoes that have NO heel. She's forced to walk on her toes with her heel suspended behind.
These shoes (which by the way, she's been seen in before) can cause stress on her Achilles tendon, causing it to inflame, and even cause heel pain. Also, because the pressure is forced to the ball of her foot, she also opens herself to possible stress fractures.
That's just the issues in her feet! She also can have pain and problems with her knees and back because of her altered gait and weight distribution. They're also a major fall waiting to happen!!
I'm pretty sure her shoes are not going to be mainstream, especially here in Houston, but I'd hope that Lady Gaga is careful of how much she wears her extreme footwear before she starts hobbling around the stage rather than dancing.