Table 1.
Demographic data of the two groups of patients
| Demographic | Ceramic-on-ceramic (80 hips) | Polyethylene (160 hips) | p value |
|---|---|---|---|
| Age at primary hip (mean years; range) | 44 (28–55) | 48 (26–57) | 0.43 |
| Age at revision (mean years; range) | 66 (56–80) | 64 (54–84) | 0.36 |
| Sex (men; number) | 59 men (74%) | 114 men (71%) | 0.24 |
| BMI (mean kg/m2; range) | 23 (16–28) | 21 (17–27) | 0.16 |
| Previous hip procedure | None (exclusion criteria) | None (exclusion criteria) | NA |
| Hip dislocation before (number) | 2 (2.5%) | 8 (5%) | 0.42 |
| Time (years) between primary and revision arthroplasty | 12 (4–25) | 15 (9–20) | 0.74 |
| Injection | None (exclusion criteria) | None (exclusion criteria) | NA |
| Activity level | Not exactly know but not high (rather normal) | Not exactly known but not high (rather normal) | NA |
BMI = body mass index; NA = not available.