About a year ago, I slipped on a tile floor and fell on my right buttock. It was quite sore for a long time but did get better. Now, I am finding that I have extreme pain to the right portion of the pelvis when I have to sit for a time span of fifteen minutes or more. I would say the pain is about one to two inches to the right of the coccyx. It does not radiate, and I don't have any numbness or pain in my upper thigh or lower back. Normally, I have no pain when standing or lying down. I teach, so I stand the majority of the day, and it does not cause problems then. I am beginning to experience more and more pain as I sit, especially when riding in a car. Based on what I read about Sciatica because I have no pain down my leg. I do have bursitis in my left knee and arthritis as well. I had a partial knee replacement at age 42. I am really beginning to worry about this pain; why it only hurts when sitting, and if I could have a fracture. Can anyone offer advice if they have experienced the same type of pain or something similar?