This same research group completed a second study that similarly evaluated knee stress when wearing clogs; Brooks Addiction stability shoes; Puma flat, soft-soled walking shoes; and flip-flops. Knee strain was again compared against barefoot walking. As before, shoes that most closely reproduced barefoot walking produced the least stress on the knee. Knee strain was greatest with the clogs and stability shoes. They postulated that heel height and shoe flexibility may have contributed to increased knee strain.
So the next time you’re looking for a good pair of walking shoes, look for ones with a flexible sole and low heel that allow you to walk like you’re barefoot.