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Frequency of stem taper damage scores for CoCr/CoCr and CoCr/Ti couples
| Alloy couple | Damage score | |||||||
|---|---|---|---|---|---|---|---|---|
| None (1) | Mild (2) | Moderate (3) | Severe (4) | |||||
| Amount | Time in situ (years) | Amount | Time in situ (years) | Amount | Time in situ (years) | Amount | Time in situ (years) | |
| CoCr/CoCr | 73% (N = 102) | 4.8 | 11% (N = 16) | 5 | 10% (N = 14) | 7 | 6% (N = 8) | 6.2 |
| Ti/CoCr | 60% (N = 77) | 1.8 | 28% (N = 36) | 2.1 | 12% (N = 15) | 1.9 | 1% (N = 1) | 0.6 |
| p value | 0.062 | 0.25 | 0.006 | 0.28 | 0.85 | 0.09 | 0.02 | 0.03 |
