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Stilettos (averaging 2.5 inches high) amplified the twisting force in knee joints while walking.
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This twisting force, known as torque, places the joints at risk for the development of knee osteoarthritis, where the cartilage between bones wears away and results in painful rubbing back and forth.
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Higher heels put great stress on the foot and ankle to maintain stability when walking, but it is ultimately the knee that suffers and is left susceptible to injury and potentially even arthritis.
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Limit how long you wear them, such as for a special event in the evening, then opt for sneakers or flats earlier in the day.
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Try out shoes with a wider, chunkier, or platform heel for more support but still with the added height.