are you talking about the coccyx? its the pointy little bone at the end of the spine. it CAN get broken, but most likely bruised or bent. there IS a surgery that can remove the end pieces, but it is very dangerous because this is where all the nerves meet. Best advice is stay off your feet and bum for a few days and see a doctor if the pain doesn't go away!
maybe if you are hurting that bad then you need to go to the doctor or just rest some and try to walk as much as u can if you walk it will take some of the pain away but if you sit down and then try to up it will only hurt worse that has happened to me before as a matter of fact it is happening to me right now.