Table 2.
Risk factors for dislocation; univariate analysis of the factors for dislocation
| Factors | Dislocation (+) | Dislocation (−) | P value |
|---|---|---|---|
| Age (years old) | 65.7 ± 12.5 | 63.1 ± 10.9 | 0.1493 |
| Height (cm) | 154 ± 11.0 | 152.5 ± 8.30 | 0.2975 |
| Body weight (kg) | 56.4 ± 13.6 | 54.9 ± 10.8 | 0.4454 |
| BMI (kg/m2) | 23.7 ± 4.45 | 23.5 ± 3.69 | 0.7817 |
| Gender | Male: 5.50 % (12/218) | Male: 94.5 % (206/218) | 0.0109* |
| Female: 2.33 % (24/1031) | Female: 97.7 % (1007/1031) | ||
| Indication of THA | OA: 1.17 % (11/944) | OA: 98.8 % (933/944) | <0.0001* |
| RA: 8.16 % (4/49) | RA: 91.8 % (45/49) | ||
| ONFH: 9.09 % (9/99) | ONFH: 90.9 % (90/99) | ||
| Revision: 7.59 % (12/158) | Revision: 92.4 % (146/158) | ||
| Prior osteotomy | Prior osteotomy (−): 2.93 % (34/1162) | Prior osteotomy (−): 97.1 % (1128/1162) | 0.7239 |
| Prior osteotomy (+): 2.27 % (2/88) | Prior osteotomy (+): 97.7 % (86/88) | ||
| Diameters of femoral head | 22 mm: 4.33 % (9/208) | 22 mm: 95.7 % (199/208) | 0.2502 |
| 26 mm: 2.71 % (22/812) | 26 mm: 97.3 % (790/812) | ||
| 32 mm: 1.60 % (3/187) | 32 mm: 98.4 % (184/187) | ||
| Neck geometry | PerFix: 4.44 % (16/360) | PerFix: 95.6 % (344/360) | 0.0077* |
| PerFix-910: 1.73 % (13/753) | PerFix-910: 98.3 % (740/753) | ||
| Cup abduction (°) | 43.5 ± 7.56 | 40.6 ± 6.24 | 0.0060* |
| Cup anteversion (°) | 12.3 ± 7.76 | 11.2 ± 6.93 | 0.3916 |
BMI body mass index, OA osteoarthritis, RA rheumatoid arthritis, ONFH idiopathic osteonecrosis of femoral head
Qualitative data were compared with χ2 test and quantitative data with the Pearson test
* Statically significant p-value <0.05