Inclusion |
Procedures performed Apr. 1, 2000, to Mar. 31, 2004 | 30 917 (100) | 39 978 (100) |
Exclusion |
Unplanned joint replacement, age < 20 yr, or non-Ontario resident | 2 536 (8.2) | 776 (1.9) |
Subsequent primary total joint replacement during the accrual period | 2 906 (9.4) | 4 925 (12.3) |
Prior joint replacement (dating back to Apr. 1, 1991) | 2 982 (9.6) | 4 312 (10.8) |
Revision procedure | 2 033 (6.6) | 1 766 (4.4) |
Multijoint (including bilateral) procedures | 121 (0.4) | 917 (2.3) |
Joint infection on admission | 13 (0.0) | 16 (0.0) |
Procedure abandoned after onset | 7 (0.0) | 7 (0.0) |
Multiple “primary” surgeons | 9 (0.0) | 30 (0.1) |
Performed in a hospital with an annual average of < 10 procedures | 14 (0.0) | 3 (0.0) |
Performed by a surgeon with an annual average of < 2 procedures | 6 (0.0) | 9 (0.0) |
Final cohort | 20 290 (65.6) | 27 217 (68.1) |