From: Metal-on-metal hip resurfacing in patients younger than 50 years: a retrospective analysis
Type | Group 1 | Group 2 | p value |
---|---|---|---|
No. of cases | 1285 | 1984 | – |
1) Acetabular failures | |||
Adverse wear | 4 (0.3%) | 7 (0.4%) | 0.8415 |
Loose acetabular component | 6 (0.5%) | 4 (0.2%) | 0.1802 |
Failure of acetabular ingrowth | 10 (0.8%) | 9 (0.5%) | 0.2340 |
Acetabular component shift | 0 (0%) | 1 (0.1%) | 0.4237 |
2) Femoral failures | |||
Early femoral neck fracture | 5 (0.4%) | 15 (0.8%) | 0.1902 |
Loose femoral component | 12 (1.0%) | 9 (0.5%) | 0.0930 |
Femoral head collapse | 2 (0.2%) | 4 (0.2%) | 0.7642 |
3) Other failures | |||
Unexplained pain | 1 (0.1%) | 3 (0.2%) | 0.5552 |
Late infection | 2 (0.2%) | 0 (0%) | 0.0784 |
Early infection | 1 (0.1%) | 1 (0.1%) | 0.7566 |
Late fracture | 2 (0.2%) | 1 (0.1%) | 0.3320 |
Recurrent instability | 3 (0.2%) | 0 (0%) | 0.0316* |
Psoas tendonitis | 1 (0.1%) | 0 (0%) | 0.2150 |
Other failuresa | 0 (0%) | 4 (0.2%) | 0.1074 |
Total failures | 48 (3.7%) | 58 (2.9%) | 0.2005 |