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Cementless cup device developed for hip replacements shows durability after more than 20 years
Date:2/2/2009

(Chicago) When a first hip replacement fails, patients may be concerned that their options for a durable hip replacement are limited and that the prognosis is poor. However, a research study to be published in the February issue of the Journal of Bone and Joint Surgery suggests that this may not be the case.

Researchers from Rush University Medical Center examined their results using one of the first cementless metal cup designs and found that fixation of the implant to bone is extremely durable even twenty years after repeat or "revision" hip replacement. The implant utilized, the Harris-Galante-1 acetabular metal shell, which is designed to allow a patient's bone to grow into the implant, remained fixed in place in 95 percent of hip revision cases at a minimum follow-up of 20 years.

The implant and its bone in-growth surface were originally developed in conjunction with Dr. Jorge Galante, an orthopedic surgeon at Rush University Medical Center and one of the present study's investigators.

The cup's porous surface allows bone and tissue to grow into the device to keep the hip implant in place. Earlier generation implants relied on the use of bone cement to secure the implant to the patient's pelvis and were associated with a higher rate of failure, particularly when used in patients who had previously had a hip implant that had failed.

"The study's results indicate that even the first generation of this device has excellent clinical results and durability," said Dr. Craig Della Valle, orthopedic surgeon at Rush and study investigator. "Even after 20 years, there is low rate of failure in terms of fixation."

Researchers previously reported the results of the use of the Harris-Galante-1 cementless acetabular shell for total hip revision procedures in 138 hips at a minimum of three, seven, and fifteen years postoperatively. The current report presents the long-term outcomes of this group at a follow-up o
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Contact: Deborah Song
deb_song@rush.edu
312-942-0588
Rush University Medical Center
Source:Eurekalert

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