Original ArticleInfection Burden for Hip and Knee Arthroplasty in the United States
Section snippets
Materials and Methods
We used the Nationwide Inpatient Sample (NIS) database [6], which is collected as part of the Healthcare Cost and Utilization Project. The NIS is an annual federal-state cooperative program designed to compile a representative sample of hospital stays in the United States. The NIS is the largest publicly available database of hospitalization records in the United States and is not limited to any particular insurance payer source. In 2004, the NIS had a sample size of about 8 million records
Results
Based on the NIS data, the number of knee procedures diagnosed with periprosthetic infection has consistently been greater than the number of infected hip arthroplasties since 1991 (Table 5, Table 6, Fig. 1). For example, in 2004, which was the most recent data currently available, an estimated 3352 hip arthroplasties were treated for infection (Table 5) compared to the estimated 5838 knee arthroplasties (Table 6). As a proportion of the total number of primary and revision arthroplasties
Discussion
The results of this study demonstrate that, relative to the total number of arthroplasties performed in the United States each year, an increasing number of hip and knee arthroplasties are being diagnosed with deep infection. The reasons underlying these apparent changes in nationwide reporting of infected total joint arthroplasty are difficult to infer from the NIS data alone. On one hand, the decreases in periprosthetic infection in primary procedures could be associated with successful
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No benefits or funds were received in support of this study.