TABLE I.
Primary THA and TKA Volumes Between 2000 and 2019, Adjusted to Include Medicare Advantage Patients
| Year | Proportion of Medicare Advantage Patients (r) | Primary THA | Primary TKA | ||
|---|---|---|---|---|---|
| Adjusted Volume (Volume/[1–r]) | Annual Percentage Change | Adjusted Volume (Volume/[1–r]) | Annual Percentage Change | ||
| 2000 | 17% | 94,846 | — | 188,118 | — |
| 2001 | 15% | 103,662 | 9.30% | 204,512 | 8.71% |
| 2002 | 14% | 108,430 | 4.60% | 220,570 | 7.85% |
| 2003 | 13% | 115,747 | 6.75% | 242,322 | 9.86% |
| 2004 | 13% | 122,976 | 6.25% | 275,206 | 13.57% |
| 2005 | 13% | 123,949 | 0.79% | 299,107 | 8.68% |
| 2006 | 16% | 125,165 | 0.98% | 305,745 | 2.22% |
| 2007 | 19% | 129,675 | 3.60% | 313,232 | 2.45% |
| 2008 | 22% | 135,129 | 4.21% | 321,469 | 2.63% |
| 2009 | 23% | 142,858 | 5.72% | 331,634 | 3.16% |
| 2010 | 24% | 149,601 | 4.72% | 348,286 | 5.02% |
| 2011 | 25% | 153,471 | 2.59% | 340,352 | −2.28% |
| 2012 | 26% | 166,045 | 8.19% | 354,089 | 4.04% |
| 2013 | 28% | 180,035 | 8.43% | 374,390 | 5.73% |
| 2014 | 30% | 190,633 | 5.89% | 377,311 | 0.78% |
| 2015 | 31% | 205,586 | 7.84% | 394,259 | 4.49% |
| 2016 | 31% | 217,680 | 5.88% | 424,338 | 7.63% |
| 2017 | 33% | 231,200 | 6.21% | 444,191 | 4.68% |
| 2018 | 35% | 247,051 | 6.86% | 463,586 | 4.37% |
| 2019 | 36% | 262,369 | 6.20% | 480,958 | 3.75% |