Crude outcome event rates, by patient and hospital characteristic and surgeon procedure volume
| Characteristic | Cohort, no. (%) of patients | Number of events per 1000 patients | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Surgical complication during index admission | Death within 90 d | Readmission for amputation, fusion or excision within 1 yr | Readmission for revision arthroplasty within 1 yr | |||||||
| Hip, n = 20 290 | Knee, n = 27 217 | Hip, n = 1 208 | Knee, n = 1 280 | Hip, n = 122 | Knee, n = 144 | Hip, n = 51 | Knee, n = 115 | Hip, n = 340 | Knee, n = 301 | |
| Total | 59.54 | 47.03 | 6.01 | 5.29 | 2.51 | 4.23 | 16.76 | 11.06 | ||
| Patient age, yr | ||||||||||
| 20–29 | 108 (0.5) | 16 (0.1) | 64.81 | 62.50 | 0.00 | 0.00 | 0.00 | 62.50 | 27.78 | 62.50 |
| 30–39 | 362 (1.8) | 78 (0.3) | 80.11 | 25.64 | 0.00 | 0.00 | 8.29 | 12.82 | 27.62 | 25.64 |
| 40–49 | 1 301 (6.4) | 691 (2.5) | 51.50 | 47.76 | 0.77 | 1.45 | 3.84 | 14.47 | 15.37 | 34.73 |
| 50–59 | 3 038 (15.0) | 3 866 (14.2) | 41.47 | 37.25 | 0.99 | 1.03 | 1.97 | 5.43 | 16.79 | 17.33 |
| 60–69 | 5 569 (27.4) | 8 642 (31.8) | 54.41 | 39.23 | 3.95 | 2.66 | 2.69 | 4.28 | 13.83 | 9.95 |
| 70–79 | 7 227 (35.6) | 10 913 (40.1) | 59.36 | 51.86 | 6.23 | 5.59 | 1.94 | 3.30 | 17.16 | 9.16 |
| 80–89 | 2 580 (12.7) | 2 961 (10.9) | 89.53 | 63.09 | 17.83 | 18.22 | 3.10 | 3.04 | 20.93 | 6.75 |
| > 90 | 105 (0.5) | 50 (0.2) | 152.38 | 160.00 | 47.62 | 20.00 | 0.00 | 0.00 | 9.52 | 20.00 |
| Patient sex | ||||||||||
| Male | 8 630 (42.5) | 10 285 (37.8) | 63.73 | 55.91 | 7.65 | 7.78 | 2.90 | 5.83 | 15.87 | 13.03 |
| Female | 11 660 (57.5) | 16 932 (62.2) | 56.43 | 41.58 | 4.80 | 3.78 | 2.23 | 3.25 | 17.41 | 9.86 |
| Patient comorbidity, Charlson index | ||||||||||
| No hospitalization | 17 483 (86.2) | 23 833 (87.6) | 55.37 | 45.53 | 4.92 | 4.74 | 2.40 | 3.69 | 15.79 | 10.24 |
| 0 | 1 749 (8.6) | 2 079 (7.6) | 78.90 | 58.20 | 10.29 | 6.73 | 2.29 | 7.70 | 20.01 | 17.32 |
| 1 | 629 (3.1) | 827 (3.0) | 101.75 | 55.62 | 9.54 | 9.67 | 3.18 | 8.46 | 33.39 | 15.72 |
| ≥ 2 | 429 (2.1) | 478 (1.8) | 53.61 | 56.49 | 16.32 | 18.83 | 6.99 | 8.37 | 11.66 | 16.74 |
| Patient’s arthritis type | ||||||||||
| Rheumatoid | 2 641 (13.0) | 3 805 (14.0) | 56.80 | 45.99 | 7.95 | 4.99 | 2.27 | 3.68 | 18.55 | 12.61 |
| Other | 17 649 (87.0) | 23 412 (86.0) | 59.95 | 47.20 | 5.72 | 5.38 | 2.55 | 4.31 | 16.49 | 10.81 |
| Patient discharge disposition | ||||||||||
| Rehabilitation unit or facility | 7 848 (38.7) | 10 572 (38.8) | 58.74 | 44.84 | 3.31 | 2.27 | 1.53 | 4.35 | 17.71 | 11.16 |
| Other | 12 442 (61.3) | 16 645 (61.2) | 60.04 | 48.36 | 7.72 | 7.21 | 3.13 | 4.15 | 16.15 | 10.99 |
| Hospital teaching status | ||||||||||
| Teaching | 7 362 (36.3) | 8 471 (31.1) | 69.82 | 56.07 | 5.16 | 5.08 | 4.35 | 3.31 | 16.30 | 10.62 |
| Other | 12 928 (63.7) | 18 746 (68.9) | 53.68 | 42.89 | 6.50 | 5.39 | 1.47 | 4.64 | 17.02 | 11.26 |
| Hospital procedure volume; hip, knee | ||||||||||
| 10–110, 10–130 | 5 303 (26.1) | 6 799 (25.0) | 49.41 | 37.36 | 6.22 | 5.44 | 2.26 | 6.62 | 17.91 | 15.15 |
| 111–150, 131–180 | 5 401 (26.6) | 6 682 (24.6) | 56.10 | 56.87 | 7.04 | 5.54 | 1.85 | 3.44 | 15.55 | 10.48 |
| 151–225, 181–270 | 4 805 (23.7) | 6 599 (24.3) | 72.22 | 45.92 | 5.20 | 5.91 | 1.25 | 3.18 | 16.23 | 10.00 |
| > 225, > 270 | 4 781 (23.6) | 7 137 (26.2) | 61.91 | 47.92 | 5.44 | 4.34 | 4.81 | 3.64 | 17.36 | 8.69 |
| Surgeon procedure volume; hip, knee | ||||||||||
| 2–25, 2–35 | 4 479 (22.1) | 6 568 (24.2) | 69.88 | 42.17 | 7.37 | 6.24 | 2.01 | 5.94 | 21.21 | 12.79 |
| 26–40, 36–50 | 6 562 (32.3) | 6 537 (24.0) | 50.14 | 54.31 | 5.49 | 4.74 | 2.59 | 3.06 | 14.93 | 10.10 |
| 41–60, 51–70 | 4 231 (20.8) | 7 171 (26.3) | 55.78 | 46.16 | 5.67 | 4.74 | 1.89 | 3.90 | 17.25 | 12.13 |
| > 60, > 70 | 5 018 (24.7) | 6 941 (25.5) | 65.76 | 45.53 | 5.78 | 5.47 | 3.39 | 4.03 | 14.75 | 9.22 |