JRI Wins Stinchfield Award

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 Findings Help Predict Longevity of Hip Implants

LOS ANGELES – (January 4, 2012) – Pivotal research into age-related wear of total hip replacement implants, performed by a research team at the Joint Replacement Institute (JRI) atSt. Vincent Medical Center, has won The Hip Society’s prestigious Frank Stinchfield Award.

The lead author was senior medical student Andrew Battenberg, under the direction of preceptor Thomas P. Schmalzried, MD, medical director of the JRI.  In this study, motion of the leg was measured by a micro-processor worn around the ankle of hip replacement patients.  A highly evolved pedometer, the device records movements of the leg in real time, similar to the cardiac Holter monitor.

The research paper,“Decreasing Patient Activity with Aging: Implications for Cross-Linked Polyethylene Wear” will be presented during the American Academy of Orthopaedic Surgeons (AAOS) conference in San Francisco on Feb. 11, 2012. First author Battenberg, Schmalzried, and co-authors Jeffrey S. Hopkins, MD and Andrew D. Kupiec share the Frank Stinchfield Hip Society Award.  The Hip Society was founded in 1968 and is dedicated to the advancement of knowledge relating to the hip joint.

Patients in this JRI study were monitored for a minimum of 10 years.  The findings indicate that as people age, their level of activity decreases and so too does the wear of their artificial joints.  “Like a set of car tires, if the mileage declines, so does the wear of the tread,” said Dr. Schmalzried.  The highest wear rate occurs in the first five years, is predictive of longer-term wear, and can be used to predict the longevity of that artificial joint.

The JRI group’s manuscript will be published in Clinical Orthopaedic and Related Research in about a year.


About the Joint Replacement Institute and St. Vincent Medical Center

The Joint Replacement Institute is a clinic of St. Vincent Medical Center, located at 2200 W. 3rd St., Suite 400, across the 3rd St. bridge from the hospital. The JRI has been performing research and treating patients since 1991 and moved to St. Vincent Medical Center in 2008.

With three consecutive years of awards for quality healthcare services from the Centers for Medicare & Medicaid Services (CMS), St. Vincent Medical Center has been ranked fifth among Best Hospitals in the Los Angeles Metropolitan area for 2011-2012, according to U.S. News & World Report.

Providing compassionate healthcare and serving the sick poor has been the mission of St. Vincent Medical Center for more than 155 years. Located in downtown Los Angeles, St. Vincent is a world-renowned, 366-bed facility, offering comprehensive medical services, including ear surgery and neurosurgery, general orthopaedics, spine care, and joint replacement, cancer treatment, cardiovascular services, thoracic surgery, electrophysiology, interventional cardiology, and multi-organ transplantation.

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