Table 1.
Characteristics of patients in the simultaneous bilateral THA and unilateral THA groups
| Unilateral THA N = 421 |
Bilateral THA N = 67 |
P-value | |
|---|---|---|---|
| Women/men, n (%) | 244 (58)/177(42) | 36 (54)/30 (46) | 0.52 |
| Age, mean (SD) | 64 (11) | 62 (9) | 0.11 |
| Charnley classification*, n (%) | . | ||
| One affected hip | 295 (70) | 0 (0) | |
| Bilateral hip affected | 114 (27) | 67 (100) | |
| Others | 12 (3) | 0 (0) | |
| Operation | 0.002 | ||
| Uncemented (NFB30) | 125 (30) | 36 (54) | |
| Hybrid (NFB40) | 126 (30) | 16 (24) | |
| Cemented (NFB50) | 163 (39) | 15 (22) | |
| Difficult primary THA (NFB60) | 6 (1) | 0 (0) | |
| scaled Orton Hip Socre (sOHS)**, mean (SD) | |||
| Before operation | 53 (20) | 53 (19) | 0.92 |
| One year after operation | 95 (9) | 98 (4) | < 0.001 |
| Five years after operation | 95 (10) | 97 (7) | 0.003 |
| Hospital visits, median (IQR)*** | 0 (0.2) | 0 (0.3) | 0.69 |
* Charnley classification
**scaled Orton Hip Score, the worst pain and physical function (0 points) and no pain and the best physical function (100 points); age and gender adjusted
*** Hospital visits, median and IQR = interquartile range