I was diagnosed with PMR 20 months ago. I am presently on 4 mgs Prednisone. Yesterday I was shopping in Walmart and did a lot of walking (I am 79). When it came time to get in my car my left leg behind my knee cramped so much I had to drag it in. Then last night I was woken up with my right leg cramping behind my knee. The pain was so bad that I was crying. I've had two children by the Lamaze method (no drugs) and this was as painful as that. Luckily I was able to message the leg until the pain eased up. I do have neuropathy in both legs due to chemo. This morning I have no problems with them, but I know that walking long distances bothers my knees and ankles, which swell because of arthritis.