Have you heard this knee walker because it is my first to hear this. Of course, I saw those wheelchairs that go around but not knee walker. What I can say to this product is that it is the most awesome thing ever invented. I cannot fathom the idea when a person cannot move around just because his or her other legs or foot is injured. Because of knee walker, you are able to walk around and enjoy life. You can visit the site here http://www.rentakneewalker.com and you will be amaze of what they can offer to you who need this support.