Table 1.
Relationship between failure modes, characteristics, and vertical size
| Characteristic | Number | Vertical size of osteonecrosis (mm)* | p Value |
|---|---|---|---|
| Failure pattern | < 0.0001 | ||
| No fracture | 38 | 2.9 ± 5.3 | |
| Biomechanical fracture | 34 | 6.4 ± 7.2 | |
| Postnecrotic fracture | 51 | 20.7 ± 8.6 | |
| Clinical diagnosis | 0.4925 | ||
| Hip dysplasia | 13 | 7.5 ± 8.0 | |
| Primary osteoarthritis | 96 | 11.3 ± 10.9 | |
| Rheumatoid arthritis | 7 | 12.8 ± 16.4 | |
| Posttraumatic arthritis | 7 | 15.9 ± 8.6 | |
| Gender | 0.0074 | ||
| Men | 63 | 13.8 ± 11.5 | |
| Women | 60 | 8.6 ± 9.6 | |
| Total | 123 | 11.3 ± 10.9 |
* Values are expressed as mean ± standard deviation.