I got a bone bruise on my hip years ago when I was in high school. It had been raining and everything was kind of slick. I was getting on the bus and the treads were still wet and my foot slid right off the step. I smacked my hip on the step edge and man, did it hurt!
I ended up with a bruise the size of my palm and it hurt to walk too much for weeks.
My mom was a lab and X-ray tech at a doctor's office and she X-rayed my hip. Nothing broken or chipped, so she and the doctor pronounced it a bone bruise. That was in like, January, and I remember it still aching when school was out. I had to be careful how I sat in my desk so I wouldn't bump that spot.