Thanks, Fern. My searches on this website always seem to pull up either nothing or too much! I remember reading about it both here and elsewhere, but wasn't sure if it was something serious I should report to my doc. I get enough grief from reporting symptoms to docs that I tend not to anymore, unless absolutely necessary. The throbbing has calmed down after physical therapy this week, but now I've got a nasty cold so have another thing to contend with! Yuck.