Table 2.
Characteristics of the total hip arthroplasty patients and operations registered in the NARA database, 1995–2006
| Denmark | Sweden | Norway | p-value a | |
|---|---|---|---|---|
| No. of THAs | 69,242 | 140,821 | 70,138 | |
| Male sex, % | 41.7 | 39.8 | 30.2 | < 0.001 |
| Age groups, % | ||||
| < 30 years | 0.5 | 0.3 | 0.5 | |
| 30–39 | 1.4 | 1.0 | 1.3 | |
| 40–49 | 4.2 | 3.5 | 3.8 | |
| 50–59 | 14.7 | 13.7 | 12.7 | |
| 60–69 | 29.9 | 28.0 | 26.4 | |
| 70–79 | 34.1 | 36.5 | 39.1 | |
| ≥ 80 years | 15.2 | 17.1 | 16.3 | < 0.001 |
| Diagnosis, % | ||||
| Primary osteoarthritis | 77.6 | 78.8 | 73.7 | |
| Inflammatory arthritis | 2.4 | 3.6 | 3.3 | |
| Hip fracture | 11.9 | 11.5 | 11.2 | |
| Childhood diseases | 3.1 | 1.8 | 8.6 | |
| Idiopatic caput necrosis | 2.8 | 2.9 | 1.3 | |
| Others | 2.3 | 1.3 | 2.0 | < 0.001 |
| Fixation, % | ||||
| Cemented | 45.9 | 88.9 | 78.9 | |
| Uncemented | 26.8 | 4.4 | 13.2 | |
| Hybrid | 26.4 | 4.0 | 4.0 | |
| Inverse hybrid | 0.6 | 2.2 | 3.8 | |
| Resurfacing | 0.3 | 0.5 | 0.2 | < 0.001 |
| Approach, % | ||||
| Posterior | 91.0 | 60.3 | 23.8 | < 0.001 |
| Cause of revision, % | ||||
| Aseptic loosening | 34.8 | 50.4 | 47.3 | |
| Deep infection | 15.8 | 15.0 | 15.5 | |
| Perioprostetic fracture | 5.1 | 6.7 | 3.5 | |
| Dislocation | 33.5 | 23.4 | 23.8 | |
| Pain only | 3.0 | 0.8 | 2.3 | |
| Others | 7.8 | 3.7 | 7.6 | < 0.001 |
| Procedure at revision, % | ||||
| Total prosthesis replaced | 16.4 | 28.4 | 21.6 | |
| Only stem replaced | 20.7 | 24.8 | 27.5 | |
| Only cup replaced | 43.7 | 29.6 | 32.9 | |
| Extraction of the total prosthesis | 8.9 | 8.6 | 9.1 | |
| Others | 10.3 | 8.6 | 8.9 | < 0.001 |
a Chi-square test for differences between countries.