After an ultrasound, a CT scan, an MRI, and a visit with my doc and an orthopedic surgeon, I think I have the final picture:
Either an injury (possibly a ski fall last March), or arthritic damage, or both caused the formation of a Baker’ Cyst. This was the cause of some low-level achy pain I’ve felt for the last couple of months. A couple of weeks ago the cyst ruptured, causing extreme pain and swelling in my lower leg and foot. This pain lasted for a couple of days, but has gradually subsided. The MRI also revealed some minor knee damage. Surgery is not called for, but I have been fitted with a high-tech knee brace which will take the pressure off my knee. Now I can get back to my typical daily moving about (walking, activity, etc.) as my own tolerance allows — which is quite a bit–I’m feeling good.
I am sorry that the knee-brace does not come with a remote. I cannot cause my leg to walk by pushing a button.*