Table 1.
Demographic data of the patient series
| Parameters | Protrusio group | Control group | p value |
|---|---|---|---|
| Number of patients (hips) | 32 (39) | 66 (86) | |
| Age (years)* | 35 ± 11 (16–54) | 32 ± 8 (15–52) | 0.089 |
| Sex (percentage male of all hips) | 5 (13%) | 49 (57%) | < 0.001 |
| Side (percentage right of all hips) | 16 (41%) | 49 (57%) | 0.101 |
| Height (cm)* | 168 ± 6 (159–176) | 175 ± 10 (152–204) | < 0.001 |
| Weight (kg)* | 63 ± 5 (55–69) | 78 ± 17 (50–145) | < 0.001 |
| Body mass index (kg/m2)* | 24 ± 4 (17–33) | 25 ± 5 (18–43) | 0.140 |
| Preoperative Merle d’Aubigné score [2]* | 14.4 ± 1.9 (11–17) | 15.3 ± 1.2 (10–17) | 0.034 |
| Preoperative Tönnis osteoarthritis score ≥ 1 [46] | 14 (36%) | 19 (22%) | 0.111 |
| Number of hips with Grade 0 (percentage) | 25 (64%) | 67 (78%) | 0.105 |
| Number of hips with Grade 1 (percentage) | 12 (31%) | 17 (20%) | 0.177 |
| Number of hips with Grade 2 (percentage) | 2 (5%) | 2 (2%) | 0.409 |
| Number of hips with Grade 3 (percentage) | 0 (0%) | 0 (0%) | 1 |
* Mean ± SD (range); categorical data are expressed as number of hips with percentage in parentheses.