News Release

Comprehensive care program helped reduce some racial disparities after hip and knee replacement

Peer-Reviewed Publication

Wolters Kluwer Health

April 18, 2022 – A "bundled care" Medicare program to improve care for patients undergoing hip or knee replacement surgery has led to reductions in some outcome disparities for Black compared with White patients, suggests a study in The Journal of Bone & Joint SurgeryThe journal is published in the Lippincott portfolio in partnership with Wolters Kluwer.

The introduction of Medicare's Comprehensive Care for Joint Replacement (CJR) Model coincided with a reduction of racial differences in hospital readmission rates after hip or knee replacement surgery, according to new research by Calin Moucha, MD, Jashvant Poeran, MD, PhD, and other colleagues at the Icahn School of Medicine at Mount Sinai, New York.

Despite gains, racial differences persist in patient characteristics and outcomes

With use of nationwide Medicare claims data, the researchers analyzed disparities between Black and White patients undergoing total hip or knee replacement surgery, before and after rollout of the CJR Model in 2016. Under the CJR Model, health-care organizations receive a single "bundled" payment for all services throughout an episode of care – from the initial hospitalization to 90 days postoperatively – providing incentives to reduce costs while improving quality of care.

The study included data on nearly 1.5 million hip or knee replacement surgeries performed from 2013 to 2018. About 5% of patients were Black.

The analysis showed substantial racial differences in patient characteristics, outcomes, and Medicare payments, both before and after implementation of the CJR Model. As a group, Black patients had higher rates of other health problems, received more blood transfusions, spent more days in the hospital, and were more likely to be discharged to an institution (such as a skilled nursing facility), rather than being sent directly home.

The CJR program led to improvements in several key outcomes, some of which differed by race. After adjustment for other factors, White patients who were managed under the CJR approach had reductions in length of hospital stay, complication rate, risk of hospital readmission within 90 and 180 days, discharge to institutional care, and Medicare payments to skilled nursing facilities.

Some of the improvements were greater among Black patients. In particular, Black patients had larger reductions in 90-day and 180-day hospital readmission rates, as well as in Medicare payments related to outpatient care.

The greater benefits among Black compared to White patients suggest that the CJR program has improved some pre-existing racial differences. "These observed racial differences may represent true 'disparities' as some may not be attributable to clinical factors and may be directly associated with poorer outcomes," the researchers write.

Dr Moucha comments, “This is an important finding as it provides insights on how to effectively reduce these disparities that we know are widespread, not just on orthopaedics, but in medicine in general.”

Dr. Poeran adds, "These results indeed seem promising, but we do have to consider alternative perspectives and explanations of our results. For example, although the effects on readmission rates are promising, the difference in payments for outpatient care – where we saw lower Medicare payments for Black patients – may also indicate potential under-utilization of postdischarge care in certain subgroups."

Together with some previous reports of outcomes after introduction of the CJR Model, the new findings "support the notion of adapting and leveraging the bundled payment program design to reduce disparities in [total hip and knee replacement] care and outcomes," the researchers write. They note that their study could not demonstrate a causal relationship between the CJR Model and the observed improvements in patient outcomes.

"A first step toward reducing racial differences that represent disparities […] is to understand the sources of these disparities," Dr. Poeran and colleagues conclude. They call for further studies to evaluate the potential of bundled payment models to reduce racial disparities, and the mechanisms by which they do so.

Click here to read “Racial Differences in Care and Outcomes After Total Hip and Knee Arthroplasties: Did the Comprehensive Care for Joint Replacement Program Make a Difference? “

DOI: 10.2106/JBJS.21.00465


About The Journal of Bone & Joint Surgery

The Journal of Bone & Joint Surgery (JBJS) has been the most valued source of information for orthopaedic surgeons and researchers for over 125 years and is the gold standard in peer-reviewed scientific information in the field. A core journal and essential reading for general as well as specialist orthopaedic surgeons worldwide, The Journal publishes evidence-based research to enhance the quality of care for orthopaedic patients. Standards of excellence and high quality are maintained in everything we do, from the science of the content published to the customer service we provide. JBJS is an independent, non-profit journal.

About Wolters Kluwer

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