While most knee replacements will function well for years, patients should be aware of the signs of failure-including increased pain or decreased function-that may require a corrective procedure known as revision total knee replacement, if necessary. "A failed knee implant is usually caused by wear and tear with subsequent loosening of the implant. Other causes are infection, instability, fracture, or stiffness," says Dr. Amar Ranawat, a hip and knee specialist in the Adult Reconstruction and Joint Replacement Division of Hospital for Special Surgery in New York City... 
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