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Jess, I think that these will hurt, especially the sciatica. For me, the impact was what triggered my bout with it. I can't imagine your knee being much happier with MORE impact since these aren't shoes so much as foot protectors. The human body just wasn't designed to run on hard surfaces.
Just like the great Bruce Denton said, "You spend years running, turning muscle into steel. But you pound around Asphalt American long enough, a piece of grissle goes 'pop' and suddenly you're a pedestrian."
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