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New Technology to Track Movement and Durability of Implants in Hip and Knee Replacement Patients
Date:1/19/2012

WINFIELD, Ill., Jan. 18, 2012 /PRNewswire/ -- Patients with hip and knee replacements can now determine over time how the implant is interacting with their body thanks to a new tracking system being used by Midwest Orthopaedics at Rush (MOR) physicians.  Drs. Scott Sporer and Wayne Paprosky, MOR hip and knee orthopaedic surgeons, are the first in the country to implant all compliant patients with radiostereometric analysis (RSA) beads, which monitor if a replacement implant is wearing down or moving.  

The procedure, performed at Central DuPage Hospital, part of Cadence Health, also provides the world's first RSA registry for implants that allows scientists to collect data on materials and designs used for hip and knee replacement prostheses.  A recently published study conducted in the Netherlands showed a 22 to 35 percent reduction in the number of revisions of RSA-tested total knee replacements as compared with non-RSA-tested total knee replacements in the national joint registries.

The use of RSA in joint replacement patients comes at a crucial time.  A pending bill in the U.S. Senate requires manufacturers to track the performance of all medical devices used for hip and knee replacements.  

RSA is a groundbreaking technology that allows x-rays to be taken from different angles creating a "stereo," three-dimensional image.   Using beads as markers around the implant, RSA helps physicians determine a hip and knee patient's progress and provides research for future implant design and technology. It also provides insight into the safest and most durable materials for implants.  

"RSA will let us track relative motion of different implant materials such as metal, plastic and ceramic and provide us data about the safety and efficacy of these devices," explains Dr. Sporer.  "Although research shows that very few hip and knee replacement patients experience failure (less than 10 percent)'/>"/>

SOURCE Midwest Orthopaedics at Rush
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