I wondered when it would happen, when the pain and weakness from post-polio, exacerbated by hip arthritis, would set me up for a fall. And now I know. The other day I took a tumble. I forgot to have my husband put my walker in the back of my mini-van. At some point this year I discovered that leaning on a cane for stability wasn’t enough, and I need a walker for literally every step. But this level of loss and disability is still new to me; sometimes I forget that my “new normal” demands things like taking a walker with me. When I got to my destination, all I…