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  • Current Epidemiology of Rev...
    Gwam, Chukwuweike, M.D; Mistry, Jaydev B., M.D; Mohamed, Nequesha, M.D; Thomas, Melbin, M.D; Bigart, Kevin C., M.D; Mont, Michael A., M.D; Delanois, Ronald E., M.D

    The Journal of arthroplasty, 07/2017, Letnik: 32, Številka: 7
    Journal Article

    Abstract Introduction Despite the excellent outcomes associated with primary total hip arthroplasty (THA), implant failure and revision continues to burden the healthcare system. The most common causes of THA failure include osteolysis, loosening, dislocation, and infection. However, the predominant etiology of THA failure has evolved and displays variability throughout the literature depending on study design. In order to thoroughly understand how THAs are failing and how to reduce this burden, it is essential to assess modes of implant failure on a large-scale. This study aims to update the current literature on rates of revision THA in the US population. Specifically, we report on: 1) etiologies for revision THA; 2) frequencies of revision THA procedures; 3) patient demographics, payor type, and US Census Region of revision THA patients; and 4) the length of stay and total costs based on type of revision THA procedure. Methods The National Inpatient Sample (NIS) database was used to identify all revision THA procedures performed between January 1, 2009 and December 31, 2013. Demographic, clinical, and economic data were obtained for 258,461 revision THAs during this time period. Patients were stratified according to etiology of failure, age, sex, race, US census region, and primary payor class in order to determine the prevalence of revision procedure performed. Results Dislocation was the main indication for revision THA (17.3%), closely followed by mechanical loosening (16.8%). The most common revision THA procedure performed was all-component revision (41.8%). Patients were most commonly white (77.4%), aged 75 years and older (31.6%), and resided in the South US census region (37.0%). The average length of stay for all procedures was 5.29 days, with arthrotomy procedures demonstrating the longest stays (10.31 days). The mean total charge for revision THA procedures was $77,851.24, with arthrotomy procedures accounting for the greatest costs ($107,371.65). Conclusion With nearly equal prevalence, dislocation and mechanical loosening make up the predominant indications for revision total hip arthroplasty in the United States. Our findings are concerning, given that these etiologies have persisted despite advancements in surgical technique and implant design. With the frequency of revision THAs projected to double in the next decade, orthopaedists must take steps to mitigate this potentially devastating complication.