Table 5.
Unplanned readmissions over 90-days episode of care by arthroplasty type
| Characteristic | Knee Arthroplasty | Hip Arthroplasty | ||
|---|---|---|---|---|
| N (%) | Readmission (95% CI) | N (%) | Readmission (95% CI) | |
| Overall | 351,183 | 6.3% (6.2, 6.4) | 164,508 | 7.0% (6.9, 7.1) |
| Sex | ||||
| Male | 127,799 (36.4%) | 6.8% (6.7, 6.9) | 63,860 (38.8%) | 6.9% (6.7, 7.1) |
| Female | 223,384 (63.6%) | 6.1% (6.0, 6.2) | 100,648 (61.2%) | 7.1% (6.9, 7.3) |
| Age, years | ||||
| 65–69 | 112,283 (32.0%) | 4.7% (4.6, 4.9) | 49,056 (29.8%) | 5.1% (4.9, 5.3) |
| 70–74 | 103,095 (29.4%) | 5.6% (5.5, 5.7) | 45,391 (27.6%) | 6.0% (5.8, 6.2) |
| 75–79 | 76,664 (21.8%) | 7.2% (7.0, 7.3) | 34,933 (21.2%) | 7.7% (7.4, 8.0) |
| 80–84 | 42,401 (12.1%) | 8.8% (8.6, 9.1) | 23,032 (14.0%) | 9.4% (9.1, 9.8) |
| ≥85 | 16,740 (4.8%) | 11.3% (10.8, 11.8) | 12,096 (7.4%) | 12.1% (11.5, 12.7) |
| Race/Ethnicity | ||||
| Non-Hispanic White | 310,029 (88.3%) | 6.2% (6.2, 6.3) | 150,707 (91.6%) | 7.0% (6.9, 7.2) |
| Non-Hispanic Black | 17,576 (5.0%) | 8.1% (7.7, 8.5) | 7,232 (4.4%) | 8.1% (7.5, 8.7) |
| Hispanic | 13,360 (3.8%) | 6.4% (6.0, 6.8) | 3,044 (1.9%) | 6.4% (5.5, 7.2) |
| Other | 10,218 (2.9%) | 5.7% (5.2, 6.1) | 3,525 (2.1%) | 4.9% (4.2, 5.7) |
| Disability entitlement a | ||||
| No | 320,125 (91.2%) | 6.0% (5.9, 6.1) | 152,317 (92.6%) | 6.7% (6.5, 6.8) |
| Yes | 31,058 (8.8%) | 9.5% (9.1, 9.8) | 12,191 (7.4%) | 11.3% (10.8, 11.9) |
| Dual eligibility b | ||||
| No | 324,423 (92.4%) | 6.0% (6.0, 6.1) | 155,315 (94.4%) | 6.8% (6.6, 6.9) |
| Yes | 26,760 (7.6%) | 9.8% (9.4, 10.2) | 9,193 (5.6%) | 11.2% (10.6, 11.9) |
| Prior hospitalization | ||||
| 0 | 323,093 (92.0%) | 6.0% (5.9, 6.1) | 150,112 (91.2%) | 6.6% (6.5, 6.7) |
| 1 | 25,581 (7.3%) | 9.5% (9.1, 9.8) | 12,651 (7.7%) | 10.1% (9.6, 10.7) |
| 2 | 2,124 (0.6%) | 16.3% (14.8, 17.9) | 1,439 (0.9%) | 18.7% (16.7, 20.7) |
| 3+ | 385 (0.1%) | 29.9% (25.3, 34.4) | 306 (0.2%) | 30.1% (24.9, 35.2) |
| Hospital LOS, days c | ||||
| <4 | 296,634 (84.5%) | 5.6% (5.5, 5.7) | 139,849 (85.0%) | 6.2% (6.1, 6.3) |
| 4–7 | 51,597 (14.7%) | 9.7% (9.5, 10.0) | 23,138 (14.1%) | 10.9% (10.5, 11.3) |
| 8+ | 2,952 (0.8%) | 21.0% (19.5, 22.5) | 1,521 (0.9%) | 21.7% (19.6, 23.8) |
| ICU/CCU d | ||||
| No | 336,649 (95.9%) | 6.2% (6.1, 6.2) | 156,869 (95.4%) | 6.8% (6.7, 6.9) |
| Yes | 14,534 (4.1%) | 10.0% (9.5, 10.4) | 7,639 (4.6%) | 11.9% (11.2, 12.6) |
| Diabetes Status | ||||
| None | 270,889 (77.1%) | 5.8% (5.7, 5.9) | 136,621 (83.0%) | 6.6% (6.4, 6.7) |
| Controlled – Uncomplicated | 72,137 (20.5%) | 7.6% (7.4, 7.8) | 25,244 (15.3%) | 8.8% (8.5, 9.2) |
| Controlled – Complicated | 5,031 (1.4%) | 11.5% (10.6, 12.4) | 1,712 (1.0%) | 14.7% (13.0, 16.4) |
| Uncontrolled | 3,126 (0.9%) | 10.6% (9.5, 11.7) | 931 (0.6%) | 12.0% (9.9, 14.1) |
Abbreviations: LOS = length of stay, ICU/CCU = intensive care unit/coronary care unit
a
“Disability” original reason for receiving Medicare.
b
Eligible for Medicare and Medicaid.
c
LOS for hospitalization during joint arthroplasty procedure
d
Admitted to ICU or CCU during hospitalization for joint arthroplasty procedure.