| HCUP | Healthcare Cost and Utilization Project |
| ICD-10 | International Classification of Diseases, 10th Revision |
| LOS | Length of stay |
| NIS | Nationwide Inpatient Sample |
| SPSS | Statistical Package for the Social Sciences |
| TKA | Total hip arthroplasty |
| UKA | Unicompartmental knee arthroplasty |
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