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    Flip-Flops, Flat Shoes Relieve Arthritic Knees

    Clogs, Stability Shoes Put More Stress on Knees Than Flat, Flexible Shoes and Flip-Flops, Study Finds
    By
    WebMD Health News
    Reviewed by Laura J. Martin, MD

    March 29, 2010 -- If you have knee pain from arthritis, wearing flat, flexible shoes may reduce the stress on your joints and keep you more comfortable, according to new research.

    In a comparison study that evaluated the force or "load" on arthritic knees while wearing clogs, athletic shoes with stability features, flat walking shoes, flip-flops, and going barefoot, the flat and flexible shoes won out, says study lead author Najia Shakoor, MD, an associate professor of internal medicine at Rush Medical College and an attending physician at Rush University Medical Center in Chicago.

    Her study is published online in Arthritis Care & Research.

    ''We know barefoot is good for your knee load from previous studies," Shakoor tells WebMD. ''Then we thought, do different shoes have different effects on the knee?" So they compared the four shoe types with going barefoot.

    The surprise? "The shoes that we intuitively recommend to our patients [with knee arthritis] and thought might be best -- stability shoes and clogs -- were associated with the highest load."

    Best Shoes for Knee Pain: Study

    Arthritis of the knee is common and a major source of disability and impaired quality of life, the researchers say. Shakoor's team evaluated 31 men and women who had knee arthritis, evaluating their gait as they wore:

    • Clogs
    • An athletic shoe that promises to minimize inward rolling of the foot
    • Flat walking shoes
    • Flip-flops

    The study was supported by the National Institutes of Health.

    Shakoor measured what's known as a knee adduction moment, ''which measures the extent of the force upon your knee as you walk."

    ''Flat walking shoes, barefoot, and flip-flops were essentially the same in load on the knee," she says. "But clogs and stability shoes result in a 15% higher load."

    ''These are just initial studies, and it's too early to recommend [changes]," she says. "But several studies are suggesting that perhaps flat, flexible footwear may help decrease loads on the knee compared to footwear that is less flexible and has higher heels. Stability shoes have higher heels [than other athletic shoes]."

    ''We think it's the flatness and the flexibility that may provide the benefit."

    And, she cautioned: "We are definitely not advocating flip-flops. A flat walking shoe would be better than a flip-flop for other reasons -- stability and the risk of falling."

    Shakoor will continue her research. With Rush University and a podiatrist, she hopes to develop a walking shoe for people with knee arthritis. She says Rush will hold the patent.

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