Mortality, Cost and Health Outcomes of Total Knee Arthroplasty in Medicare Patients

  Mortality, Cost and Health Outcomes of Total Knee Arthroplasty in Medicare
                                   Patients

PR Newswire

MENLO PARK, Calif., March 27, 2013

MENLO PARK, Calif., March 27, 2013 /PRNewswire/ -- Exponent, Inc.
(NASDAQ:EXPO), is pleased to announce that its scientists have recently had
their study on mortality, cost, and health outcomes of total knee arthroplasty
in Medicare patients published online in the Journal of Arthroplasty.

In the study of Medicare records, Exponent scientists examined the effects of
joint replacement among nearly 135,000 patients with new diagnoses of
osteoarthritis of the knee from 1997 to 2009. About 54,000 opted for knee
replacement; 81,000 did not. Three years after diagnosis, the knee
replacement patients had an 11 percent lower risk of heart failure. And after
seven years, their risk of dying for any reason was 50 percent lower.

The theory behind knee replacement, said the study's lead author, Dr. Scott
Lovald, Senior Associate at Exponent, is that treating this degenerative
condition will allow a return to normal activity and ultimately improve
overall quality of life. "At the end of the day, we're trying to figure out
if quantity of life increases as well," he added, noting that the team was
conducting a similar review of Medicare data on the long-term benefits of hip
replacement surgery.

"These patients had improved survivorship and reduced risk for cardiovascular
conditions." "For an incremental cost of less than $3,000 per year, total knee
replacement may reduce the risk of mortality by half."

A subsequent review of Medicare data on long term benefits of hip replacement
surgery is showing that Total Hip Replacement (THR), or hip replacement, is
associated with reduced mortality, heart failure, depression and diabetes
rates in Medicare patients with osteoarthritis. The results of the study were
presented at the 2013 Annual Meeting of the American Academy of Orthopaedic
Surgeons (AAOS) held in Chicago March 19-22nd.

View the full abstract here:
http://www.arthroplastyjournal.org/article/S0883-5403(12)00528-1/abstract

Exponent, Inc. is a multidisciplinary organization of scientists, physicians,
engineers, and business consultants performing in-depth investigations in more
than 90technical disciplines. The company investigates and analyzes failures
and accidents to determine their causes and prevention and evaluates and
solves complex human health and environmental issues. Exponent is certified
to ISO 9001.

Exponent can be reached at (888) 656-EXPO or www.exponent.com or
info@exponent.com.

SOURCE Exponent, Inc.

Website: http://www.exponent.com
Contact: Dr. Angela Meyer, Exponent, Inc., (888) 656-EXPO, ameyer@exponent.com