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J Knee Surg 2020; 33(04): 378-386
DOI: 10.1055/s-0039-1677857
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Who, What, and Where of Primary TKAs: An Analysis of HCUP Data from 2009 to 2015

Chukwuweike Gwam 
1   Department of Orthopedic Surgery, Wake Forest University School of Medicine, Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
,
Samuel Rosas
1   Department of Orthopedic Surgery, Wake Forest University School of Medicine, Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
,
Rashad Sullivan
1   Department of Orthopedic Surgery, Wake Forest University School of Medicine, Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
,
T. David Luo
1   Department of Orthopedic Surgery, Wake Forest University School of Medicine, Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
,
Cynthia L. Emory
1   Department of Orthopedic Surgery, Wake Forest University School of Medicine, Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
,
Johannes F. Plate
2   Department of Orthopedics, Duke University School of Medicine, Durham, North Carolina
› Author Affiliations
Further Information

Publication History

01 November 2018

16 December 2018

Publication Date:
15 February 2019 (online)

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Abstract

The aim of this study was to assess (1) temporal trends, (2) primary indication, (3) patient-level demographics (age, race, gender, health status, and median income quartile), and (4) region and hospital type for all patients receiving primary total knee arthroplasty (TKA) between 2009 and the third quarter of 2015. The National Inpatient Sample Database (NIS) was used to identify all patients who underwent a TKA between 2009 and the third quarter of 2015. Regression analysis was utilized to assess trends. Chi-square analysis was used to explore categorical variables whereas Kruskal–Wallis test was used to explore nonparametric continuous variables. TKA utilization increased between 2009 and 2015 with the highest volume occurring during the fall. Primary osteoarthritis was the primary indication in 98% of cases. There was an increase in minority representation among recipients. Black TKA recipients were younger and had lower median age-adjusted Charlson's comorbidity index (CCI). Black recipients were most likely to be of the lowest 25% of median income than any other races. The Midwest demonstrated the greatest increase in TKAs performed per 100,000 between 2009 and 2014. Case volumes shifted to urban teaching hospitals between 2009 and 2014. There were differences in age of presentation, preoperative morbidity, and income status among races. Furthermore, our findings revealed a more rapid growth in TKA procedures per 100,000 in the Midwest, in addition to volume shifts toward urban teaching hospitals. Future studies are needed to update our findings as well as explore trends in racial disparities for primary TKA recipients.

Keywords

primary TKAs - economics - racial disparities - total knee arthroplasty - health care access
 

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