Table I.
Comparison of demographics and clinical characteristics among revision time groups
| Variable | The duration between primary hip arthroplasty and revision surgery | Total (N = 396) | P-value | |||
|---|---|---|---|---|---|---|
| < 2 years (very early) (n = 120) | 2–5 years (early) (n = 94) | 5–10 years (inter-mediate) (n = 98) | > 10 years (late) (n = 84) | |||
| Age [years] | 64.2 ±13.7 (29–89) | 65.0 ±13.2 (36–91) | 68.3 ±13.9 (34–88) | 67.1 ±13.1 (37–86) | 65.9 ±13.6 (29–91) | 0.143* |
| Sex: | 0.107** | |||||
| Female | 92 (77%) | 61 (65%) | 61 (62%) | 58 (69%) | 272 (69%) | |
| Male | 28 (23%) | 33 (35%) | 37 (38%) | 26 (31%) | 124 (31%) | |
| Aetiology for index hip arthroplasty: | < 0.001** | |||||
| Primary osteoarthritis | 46 (38%) | 39 (42%) | 58 (59%) | 52 (62%) | 195 (49%) | |
| Hip fracture | 34 (28%) | 31 (33%) | 26 (27%) | 22 (26%) | 113 (28%) | |
| Hip dysplasia | 27 (23%) | 12 (13%) | 4 (4%) | 5 (6%) | 48 (12%) | |
| Rheumatoid arthritis | 6 (5%) | 4 (4%) | 8 (8%) | 2 (3%) | 20 (5%) | |
| Avascular necrosis of femoral head | 4 (3%) | 7 (7%) | 2 (2%) | 1 (1%) | 14 (4%) | |
| Epiphysiolysis – Perthes | 2 (2%) | 1 (1%) | 0 (0%) | 1 (1%) | 4 (1%) | |
| Post-traumatic arthritis | 1 (1%) | 0 (0%) | 0 (0%) | 1 (1%) | 2 (1%) | |
| Index arthroplasty procedure: | 0.280** | |||||
| Total | 88 (73%) | 64 (68%) | 76 (78%) | 67 (80%) | 295 (75%) | |
| Hemiarthroplasty | 32 (27%) | 30 (32%) | 22 (22%) | 17 (20%) | 101 (25%) | |
| Indication for revision hip arthroplasty: | < 0.001** | |||||
| Aseptic loosening: | ||||||
| Acetabular component | 2 (2%) | 4 (4%) | 9 (9%) | 6 (7%) | 21 (5%) | |
| Femoral component | 10 (8%) | 26 (28%) | 31 (33%) | 15 (18%) | 82 (21%) | |
| Both | 7 (6%) | 12 (13%) | 14 (14%) | 27 (32%) | 60 (15%) | |
| Infection | 28 (23%) | 23 (25%) | 11 (11%) | 5 (6%) | 67 (17%) | |
| Instability | 46 (38%) | 4 (4%) | 7 (7%) | 1 (1%) | 58 (15%) | |
| Periprosthetic fracture | 11 (9%) | 5 (5%) | 4 (4%) | 6 (7%) | 26 (7%) | |
| Metallosis | 0 (0%) | 7 (8%) | 12 (12%) | 0 (0%) | 19 (5%) | |
| Acetabular erosion | 8 (7%) | 2 (2%) | 2 (2%) | 6 (7%) | 18 (5%) | |
| Osteolysis: | ||||||
| Acetabular component | 4 (3%) | 1 (1%) | 1 (1%) | 0 (0%) | 6 (2%) | |
| Femoral component | 1 (1%) | 2 (2%) | 0 (0%) | 1 (1%) | 4 (1%) | |
| Both | 1 (1%) | 0 (0%) | 0 (0%) | 0 (0%) | 1 (0%) | |
| Polyethylene bearing wear | 0 (0%) | 5 (5%) | 3 (3%) | 12 (15%) | 20 (5%) | |
| Mechanical failure of implants | 2 (2%) | 3 (3%) | 3 (3%) | 5 (6%) | 13 (3%) | |
| Failed hip resurfacing | 0 (0%) | 0 (0%) | 1 (1%) | 0 (0%) | 1 (0%) | |
| Type of revision hip arthroplasty: | 0.031** | |||||
| Total | 92 (77%) | 74 (78%) | 77 (79%) | 79 (95%) | 322 (81%) | |
| Acetabular | 7 (6%) | 6 (6%) | 8 (8%) | 2 (2%) | 23 (6%) | |
| Femoral | 17 (14%) | 7 (8%) | 10 (10%) | 1 (1%) | 35 (9%) | |
| Insert exchange | 4 (3%) | 7 (8%) | 3 (3%) | 2 (2%) | 16 (4%) | |
*
P-value according to one-way ANOVA test
**
P-value according to Pearson’s χ2 test, Bold p-values indicate statistical significance.