Table 2.
Articular wear analysis
| UEP (n = 35) | Control (n = 59) | p value | |
|---|---|---|---|
| Articular linear wear (μm) | |||
| Head* | 5.4 (0–144.8) | 10.8 (0–433.0) | 0.12 |
| Cup* | 2.0 (0–233.3) | 18.5 (0–703.8) | 0.001 |
| Total* | 8.1 (0–378.0) | 34.9 (0–954.8) | < 0.001 |
| Total linear wear rate (μm/year)* | 2.6 (0–128.2) | 12.8 (0–232.1) | < 0.001 |
| Number of hips with total linear wear rate > 5† | 8 (22.9) | 37 (62.7) | < 0.001 |
| Articular volumetric wear (mm3) | |||
| Head* | 0.8 (0–69.2) | 2.2 (0–201.0) | 0.13 |
| Cup* | 0 (0–60.1) | 1.2 (0–184.4) | 0.006 |
| Total* | 0.9 (0–129.3) | 5.0 (0–345.9) | 0.006 |
| Total volumetric wear rate (mm3/year)* | 0.3 (0–29.3) | 1.5 (0–94.3) | 0.02 |
* Values are expressed as median, with range in parentheses; †values are expressed as frequency, with percentage in parentheses; UEP = unexplained pain.