@burcinc-- Yes, the pain from a hip bone spur can be felt at the knee. At least, that's what I've read. For majority of people though, the pain is at the hip. Some people also feel pain around the groin or the thigh. So pain can be felt in different locations. The only way to be sure that the cause is a bone spur at the hip is to get an x-ray of the hip. Otherwise the pain might be confused with other types of pain or other problems.
Also, the intensity of the pain caused by the bone spur usually depends on what position the person is in. Like the article said, when there is pressure placed on that part of the hip bone, the pain will be more intense. So you might want to watch out for this detail.