Table 1.
Distribution of development of heterotopic ossifications (HO) among patients by rank
| Character | Rank | Presence of HO (%) | Absence of HO (%) | p values |
|---|---|---|---|---|
| Age | Mean age = 77.6 years | Mean age = 80.2 years | 0.0018 | |
| Sex | Male | 64.4 | 35.6 | 0.1011 |
| Female | 57.7 | 42.3 | ||
| Diagnosis of diseased hip | Coxarthrosis | 72.7 | 27.3 | 0.0001 |
| Femoral neck fracture | 55.9 | 44.1 | ||
| Others | 82.9 | 17.1 | ||
| Previous HO | Presence | 76.2 | 23.8 | 0.0260 |
| Absence | 58.8 | 41.2 | ||
| Surgical approach to the hip | Watson-Jones | 55.6 | 44.4 | 0.0163 |
| Hardinge-Bauer | 65.5 | 34.5 | ||
| Kind of implant | Ceramic-ceramic THR | 68.1 | 31.9 | 0.0001 |
| Partial prosthesis | 51.3 | 48.7 | ||
| TriboFit® system | 67.0 | 33.0 | ||
| Previous surgery of the ipsilateral hip (only among ceramic-ceramic THR) | Presence | 75.0 | 25.0 | 0.4896 |
| Absence | 67.5 | 32.5 |