Table 3.
Time elapsed (years) before revision for the three bearing types
| Reason for revision (n = 2107) | Ceramic-on-ceramic (n = 238) |
Metal-on-metal (n = 148) |
Polyethylene (n = 1721) |
p value |
|---|---|---|---|---|
| Cup + stem loosening | 8 (0.4–25)a | 7 (0.2–35)b | 15 (0.03–42)c | < 0.001 |
| Periprosthetic fracture | 5 (0.03–15)d | 7 (0.06–37)e | 10 (0.02–36)f | 0.0023 |
| Infection | 1.5 (0.03–28)g | 4 (0.03–12)h | 3 (0.02–35)i | 0.0402 |
| Osteolysis | 10 (5–21) | 8 (4–10) | 16 (6–32) | N/A |
| Dislocation | 1 (0.02–17)j | 8 (0.3–17)k | 6 (0–33)l | 0.0307 |
| Stem loosening | 4 (0.4–17)m | 3 (0.7–8)n | 14 (0.3–31)o | < 0.001 |
| Technical error | 2 (0.01–10) | 2 (0.1–3) | 1 (0.01–25) | 0.112 |
| Iliopsoas irritation | 3 (0.5–9) | 3 (1–4) | 3 (0.5–13) | N/A |
| Miscellaneous | 2 (0.05–6) | 4 (1–11) | 11 (0.01–32) | N/A |
| Implant fracture | 2 (0.7–3) | 9 (4–11) | 11 (0.5–30) | N/A |
| Unexplained pain | 5 (1–10) | 4 (1–10) | 4 (1–18) | N/A |
| Bulk ceramic fracture | 2 (1–25) | – | 11 (0.9–25) | 0.028 |
| Prosthetic Impingement | 2 (1–6) | 2 (0.3–5) | 2 (1 hip) | N/A |
| Ceramic sandwich fracture | 9 (4–11) | – | – | N/A |
| Squeaking | 3 (2–9) | 0.2 (1 hip) | – | N/A |
| Total | 3 (0.01–28)p | 4 (0.03–37)q | 13 (0–42)r | < 0.001* |
Pairwise comparisons were performed using the Bonferroni procedure or the Dwass, Steel, Critchlow-Fligner multiple comparison procedure; a versus b: p = 0.4329; a versus c: p < 0.0001; b versus c: p < 0.0001; d versus e: p = 0.3586; d versus f: p = 0.0018; e versus f: p = 0.7022; g versus h: p = 0.2334; g versus i: p = 0.0377; h versus i: p = 0.8381; j versus k: p = 0.0566; j versus l: p = 0.0294; k versus l: p = 0.9645; m versus n: p = 0.6945; m versus o: p = 0.0003; n versus o: p = 0.0006; p versus q: p = 0.1928; p versus r: p < 0.0001; q versus r: p < 0.0001; N/A = not applicable.