I had my knees checked out this morning at the orthopaedic clinic. I hadn't been in since 2007, just before I started training for my first 3 Day Walk. The good news is that the knees are not markedly deteriorated. Both my quad and hamstring muscles are strong. Each knee has patella arthritis. Dr. Daly believes the pain I've had is a result of attempting too much knee bend or too much weight lifted when bending the knee -- both easy to adjust in the gym. He offered me an MRI to check out a few more things, but we agreed I'd be back for an MRI only if I have additional pain or swelling.
I train at 5:30am tomorrow.