Table 4.
Involved joint(s) stratified by discharge year: percentage.
| Involved Joint(s)* | Total | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 |
|---|---|---|---|---|---|---|---|---|---|---|
| Unilateral hip | 34.0% | 38.4% | 39.3% | 36.5% | 34.7% | 32.6% | 30.6% | 30.4% | 29.6% | 29.3% |
| Bilateral hip | 0.9% | 1.0% | 1.0% | 0.9% | 0.8% | 0.7% | 0.7% | 1.0% | 1.1% | 1.2% |
| Unilateral knee | 54.0% | 47.4% | 50.2% | 54.2% | 56.4% | 57.9% | 56.8% | 53.3% | 51.2% | 48.7% |
| Bilateral knee | 10.4% | 7.7% | 7.9% | 8.0% | 7.9% | 8.7% | 11.8% | 15.2% | 18.0% | 20.6% |
| Hip/knee same side | 0.1% | 0.1% | 0.1% | 0.2% | 0.1% | 0.1% | 0.1% | 0.1% | 0.1% | 0.1% |
| Hip/knee opposite sides | 0.1% | 0.0% | 0.1% | 0.1% | 0.1% | 0.0% | 0.0% | 0.0% | 0.0% | 0.1% |
Yearly summaries represent fiscal year periods (Oct 1 through Sep 30) from the Centers for Medicare and Medicaid Services. Dashed vertical line signifies introduction of the prospective payment system (PPS), resulting in substantial changes to functional evaluation and patient management processes.
*
Prior to PPS (2002) a category of Hip (unspecified) and Knee (unspecified) existed in the orthopedic RIC. These accounted for less than 0.5% of the total cases and are not included in Table 4.