This is a Pavlik Harness. It is used to restrain both legs in order to help reset bones. It certainly appears to be uncomfortable, but then it is useful in keeping the broken limb from becoming exacerbated. This type of harness makes it very difficult to perform regular tasks. The leg you are seeing the broken femur and as you can see it is unusual that there are no bruises or marks. Although there was no swell, it is hard to see that because of the way the leg is being held.