Manolo says, her this the Manolo’s latest column for the Express of the Washington Post. Dear Manolo I am only 44 but was recently diagnosed with arthritis in my knees and was told by my doctor NO high heels. Any time I cheat and wear even a low heel (2 inches) I end up in pain for three days, so I’m back to flats. This summer has been fine because I can get away with ballet flats, and I can wear riding boots with skirts in the winter, but when I need to look really professional for special meetings and…