Will total knee replacement help my problem? both legs from knees to feet ache all day and night. top of feet sore to touch. walking 20 to 30 minutes is extent of mobility time. must sit for a few minutes.

Please : Please see an orthopedic specialist for a complete evaluation of your knees if you haven't done so. If your x-rays show "bone on bone" arthritis, where your joint space is completely obliterated, and you have failed bracing and nsaids such as advil, (ibuprofen) then you may need a knee replacement. Possibly though you have another diagnosis such as neuropathy, which is a nerve condition of your legs, or even vascular disease such as claudication. You need a complete workup to find out for sure.

Not Sure: Knee replacement probably will not help your problem. The description of an ache form the knees to the top of the feet that that gets worse with walking and requires you to sit down after 20-30 min sounds more like a back problem called spinal stenosis.