Table 4.
Periacetabular osteolysis as outcome-proportional odds model.
| Variables | Univariable | Multivariable with wear as categ. data <30% and ≥30% | ||||
|---|---|---|---|---|---|---|
| Odds ratio | 95% confidence interval | P value | Odds ratio | 95% confidence interval | P value | |
| Wear (head penetration into the liner in mm)* | 1.4 | 1.1–1.8 | 0.002 | 2.1 | 1.1–3.9 | 0.028 |
| Cup age | 1.1 | 0.9–1.2 | 0.452 | 1.0 | 0.9–1.2 | 0.623 |
| Patient age at time of surgery* | 0.9 | 0.6–1.4 | 0.770 | 1.0 | 0.7–1.5 | 0.996 |
| Male versus Female | 1.8 | 1.0–3.1 | 0.042 | 1.8 | 1.0–3.2 | 0.045 |
| UCLA Activity Score | 1.0 | 0.9–1.2 | 0.827 | |||
| Cup type categ.: Romanus HA/Romanus non-HA/other cups | 1.1 | 0.6–2.1 | 0.649 | 1.1 | 0.6–2.1 | 0.714 |
| Liner ≥ 6 mm versus <6 mm | 0.9 | 0.5–1.7 | 0.724 | 1.0 | 0.5–2.0 | 0.979 |
| BMI* | 1.0 | 0.8–1.6 | 0.931 | |||
| Anteversion* | 1.3 | 0.8–2.1 | 0.383 | |||
| Inclination* | 1.2 | 0.9–1.6 | 0.309 | |||
*Modelled as continuous variables but presented in units of ten.