premise: On my way to gym , my left foot caught in a pivot in the pavement . I fell , slamming my right knee into the pavement and jarring my hips and back ... before I hit the ground . I was helped up by several people who saw me fall , and found myself able to stand . After trying to walk a short distance , I realized something was wrong with me physically . What may have caused something to be wrong with you physically ?
hypothesis: I tripped in the parking lot .