TABLE II.
Characteristics of Medicare Beneficiaries Receiving Revision Total Hip Arthroplasty Between 1991 and 2008*
| Characteristic | 1991-1993 | 1994-1996 | 1997-1999 | 2000-2002 | 2003-2005 | 2006-2008 |
| No. of hospitalizations | 48,528 | 53,622 | 57,886 | 62,604 | 57,903 | 57,331 |
| 38,052 | 43,034 | 46,599 | 49,501 | 44,401 | 42,775 | |
| Age† (yr) | 75.9 ± 6.9 | 76.4 ± 6.9 | 77.0 ± 6.9 | 77.2 ± 6.9 | 77.4 ± 6.9 | 77.4 ± 7.2 |
| 75.1 (6.5) | 75.8 (6.5) | 76.4 (6.6) | 76.6 (6.7) | 76.9 (6.7) | 76.7 (6.9) | |
| Female sex (no. [%]) | 31,084 (64.1) | 34,124 (63.6) | 36,556 (63.2) | 39,353 (62.9) | 36,110 (62.4) | 35,500 (61.9) |
| 23,854 (62.7) | 26,801 (62.3) | 28,835 (61.9) | 30,456 (61.5) | 26,974 (60.8) | 25,927 (60.6) | |
| Race (no. [%]) | ||||||
| White | 44,325 (91.3) | 50,031 (93.3) | 54,128 (93.5) | 58,327 (93.2) | 53,988 (93.2) | 53,499 (93.3) |
| 34,788 (91.4) | 40,208 (93.4) | 43,648 (93.7) | 46,119 (93.2) | 41,441 (93.3) | 39,958 (93.4) | |
| Black | 2072 (4.3) | 2431 (4.5) | 2688 (4.6) | 2967 (4.7) | 2675 (4.6) | 2553 (4.5) |
| 1581 (4.2) | 1947 (4.5) | 2122 (4.6) | 2366 (4.8) | 2029 (4.6) | 1905 (4.5) | |
| Other‡ | 634 (1.3) | 600 (1.1) | 828 (1.4) | 1081 (1.7) | 1084 (1.9) | 1162 (2.0) |
| 504 (1.3) | 459 (1.1) | 650 (1.4) | 841 (1.7) | 814 (1.8) | 825 (1.9) | |
| Missing | 1497 (3.1) | 560 (1.0) | 242 (0.4) | 229 (0.4) | 156 (0.3) | 117 (0.2) |
| 1179 (3.1) | 420 (1.0) | 179 (0.4) | 175 (0.4) | 117 (0.3) | 87 (0.2) | |
| Comorbidities (no. [%]) | ||||||
| Diabetes | 3624 (7.5) | 5074 (9.5) | 6312 (10.9) | 7715 (12.3) | 8029 (13.9) | 8797 (15.3) |
| 2714 (7.1) | 3889 (9.0) | 4991 (10.7) | 5980 (12.1) | 6090 (13.7) | 6605 (15.4) | |
| Congestive heart failure | 2752 (5.7) | 4050 (7.6) | 4649 (8.0) | 5615 (9.0) | 5739 (9.9) | 5474 (9.6) |
| 1723 (4.5) | 2665 (6.2) | 3112 (6.7) | 3688 (7.5) | 3625 (8.2) | 3308 (7.7) | |
| Obesity | 695 (1.4) | 1120 (2.1) | 1351 (2.3) | 1747 (2.8) | 1992 (3.4) | 2559 (4.5) |
| 594 (1.6) | 951 (2.2) | 1147 (2.5) | 1439 (2.9) | 1648 (3.7) | 2081 (4.9) | |
| Renal failure | 414 (0.9) | 564 (1.1) | 756 (1.3) | 1048 (1.7) | 1283 (2.2) | 3531 (6.2) |
| 275 (0.7) | 357 (0.8) | 506 (1.1) | 703 (1.4) | 788 (1.8) | 2301 (5.4) | |
| No. of comorbid conditions† | 1.2 ± 1.2 | 1.5 ± 1.4 | 1.7 ± 1.4 | 1.9 ± 1.5 | 2.1 ± 1.5 | 2.3 ± 1.5 |
| 1.1 ± 1.2 | 1.5 ± 1.4 | 1.6 ± 1.4 | 1.8 ± 1.4 | 2.0 ± 1.5 | 2.2 ± 1.5 | |
*
Gray shading indicates values for the elective cohort (i.e., excluding patients admitted through the emergency room or transferred in from another hospital). P < 0.001 for all comparisons except for Black race (p = 0.005 for all revision total hip arthroplasties and p = 0.04 for elective revision total hip arthroplasties).
†
Values are given as the mean and the standard deviation.
‡
Asian, Hispanic, North American Native, or other not specified.