I have progressing posterior lower leg ache, with a heavy feeling in my leg. My knee hurts if I straighten it too far, and I have decreased knee flexion due to pain, tight feeling. No injury. I m 64, female, average weight, no history of blood clots, or diabetes. I was told I have some lumbar spine arthritis several years ago. No back pain. I did smoke for 20 years, but quit in 1989. Not sure if this is a type of sciatica or a venous claudication issue. I am a retired nurse, I spent a lot of years on my feet.