question: I have osteo athritis in rt. knee, i m 70 yrs old female and recently I can t sit down for more than 45 minutes without getting up or my leg is stiff and takes a moment to use. I also feel my sitting down bones? Pelvic bones? and I have some bruising on left side where I roll to left on toilet seat to wipe myself.I have some arthritis in hand knuckles too. It s inherited.