New York City—July 12, 2010
"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.
Each year, more than 300 patients elect to receive revision knee surgery at Hospital for Special Surgery, despite the fact that their original surgery was performed elsewhere.
The most common symptoms of a failed knee implant are pain, instability, swelling and stiffness across the entire knee (generalized) or in a small section (localized).
Although knee replacements normally perform well for at least 15-20 years in more than 95 percent of patients, Dr. Ranawat says there are five primary reasons why a knee implant fails:
Revision total knee replacement is a complex procedure that requires extensive pre-operative planning, specialized implants and tools, prolonged operating times and mastery of difficult surgical techniques. It usually takes longer to perform than the original knee replacement, says Dr. Ranawat, and is composed of the following stages:
Dr. Ranawat says that more than 80 percent of patients who undergo revision knee surgery can expect to have good to excellent results. However, he cautions that complete function is not restored for all patients and “up to 20 percent of patients may still experience pain following surgery for months or even years."
With the right tools at hand, revision total knee replacements can deliver the best outcomes possible. A center devoted to bone, joint, muscle and tendon conditions, like Hospital for Special Surgery, has the surgical expertise and resources necessary to deliver the best prognoses and to promise the best outcomes possible for this complex—but necessary—procedure.
Hospital for Special Surgery performs more knee replacements and more hip surgeries than any other hospital in the nation. Visit our Revision Total Knee Replacement page for more information.