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Frequency of head 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 | 74% (N = 103) | 4.9 | 11% (N = 15) | 6.2 | 7% (N = 10) | 3.9 | 9% (N = 12) | 6.2 |
| Ti/CoCr | 63% (N = 81) | 1.8 | 12% (N = 16) | 2.1 | 17% (N = 22) | 1.8 | 8% (N = 10) | 3.5 |
| p value | 0.11 | 0.23 | 0.86 | 0.067 | 0.003 | 0.38 | 0.67 | 0.39 |
