Table 1.
Demographic data of the patient series
| Parameter | Value |
|---|---|
| Number of patients (hips) | 63 (75) |
| Percentage of bilateral hips | 16 |
| Age at surgery (years) | 29.3 ± 11.6 (13–56) |
| Gender (percent male of all hips) | 23 |
| Side (percent right of all hips) | 49 |
| Weight (kg) | 61 ± 11.4 (41–86) |
| Height (cm) | 166 ± 8.6 (149–186) |
| Body mass index (kg/m2) | 22.1 ± 3.1 (15.8–28.2) |
| Operation time (hours) | 3.5 ± 0.73 (2.0–5.0) |
| Blood loss (L) | 2.0 ± 0.86 (0.8–4.5) |
| Red blood cell concentrates (units) | 3.8 ± 1.93 (1–11) |
| Concomitant intertrochanteric osteotomy (percent) | 21 |
| Previous surgery to attempt sufficient coverage (percent) | 31 |
| Sphericity index [48] (percent) | 79 ± 9.1 (53–95) |
| Severin classification [44] (percent) | |
| Class 1 | — |
| Class 2 | 1 |
| Class 3 | 50 |
| Class 4 | 44 |
| Class 5 | 5 |
| Class 6 | — |
| Preoperative osteoarthritis score according to Tönnis [55] (percent) | |
| Grade 0 | 43 |
| Grade 1 | 33 |
| Grade 2 | 21 |
| Grade 3 | 3 |
Values of continuous parameters are expressed as mean ± standard deviation with range in parentheses.