I missed everything in the doctor's explanation of my condition after she used the "A" word.

So she kindly repeated it, with "aging" coming at the end of her spiel as "only one" of the possible causes. But really, "It's not too serious."

By this time, both my X-ray shots and the medical knee model on the desk were dotted in little blue pen marks, as the doctor persistently tapped out her diagnosis.