Table 3.
All-cause, aseptic, and septic revision rates per 100 observation years, and reasons for revision, listed according to type of highly crosslinked polyethylene (all on cobalt-chromium alloy) a
| Total CoCr-HXLPE | CoCr-Durasul | CoCr-Prolong | CoCr-Sigma XLK | CoCr-Other HXLPE | |
|---|---|---|---|---|---|
| (n = 7,618) | (n = 557) | (n = 5,132) | (n = 1,481) | (n = 448) | |
| All-cause revisions, n b | 157 | 20 | 115 | 18 | 4 |
| Total observation years | 16,478 | 1,908 | 11,713 | 2,431 | 427 |
| Revisions per 100 obs. years, % (95% CI) | 0.95 (0.81–1.11) | 1.05 (0.68–1.62) | 0.98 (0.82–1.18) | 0.74 (0.47–1.18) | 0.94 (0.35–2.50) |
| Aseptic revision, n c | 86 | 13 | 66 | 4 | 3 |
| Total observation years | 16,478 | 1,908 | 11,713 | 2,431 | 427 |
| Revisions per 100 obs. years, % (95% CI) | 0.52 (0.42–0.64) | 0.68 (0.40–1.17) | 0.56 (0.44–0.72) | 0.16 (0.06–0.44) | 0.70 (0.23–2.18) |
| Septic revision, n d | 71 | 7 | 49 | 14 | 1 |
| Total observation years | 16,478 | 1,908 | 11,713 | 2,431 | 257 |
| Revisions per 100 obs. years, % (95% CI) | 0.43 (0.34–0.54) | 0.37 (0.17–0.77) | 0.42 (0.32–0.55) | 0.58 (0.34–0.97) | 0.39 (0.05–2.76) |
| Reasons for revision e | |||||
| Infection | 71 (45.2) | 7 (35.0) | 36 (39.6) | 14 (77.8) | 1 (25.0) |
| Instability | 43 (27.4) | 3 (15.0) | 39 (33.9) | 0 (0.0) | 1 (25.0) |
| Pain | 25 (15.9) | 3 (15.0) | 19 (16.5) | 3 (16.7) | 0 (0.0) |
| Arthrofibrosis | 15 (9.6) | 4 (20.0) | 9 (7.8) | 1 (5.6) | 1 (25.0) |
| Aseptic loosening | 11 (7.0) | 2 (10.0) | 6 (5.2) | 2 (11.1) | 1 (25.0) |
| Wound drainage | 3 (1.9) | 0 (0.0) | 3 (2.6) | 0 (0.0) | 0 (0.0) |
| Femoral fracture | 2 (1.3) | 0 (0.0) | 2 (1.7) | 0 (0.0) | 0 (0.0) |
| Ingrowth failure | 2 (1.3) | 2 (10.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Patello-femoral joint malfunction | 2 (1.3) | 1 (5.0) | 1 (0.9) | 0 (0.0) | 0 (0.0) |
| Synovial impingement | 2 (1.3) | 0 (0.0) | 2 (1.7) | 0 (0.0) | 0 (0.0) |
| Hematoma | 1 (0.6) | 1 (5.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Failed extensor mechanism | 1 (0.6) | 0 (0.0) | 1 (0.9) | 0 (0.0) | 0 (0.0) |
| Polyethylene liner wear | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Other | 9 (5.7) | 1 (5.0) | 7 (6.1) | 1 (5.6) | 0 (0.0) |
a Comparison of revision rate per 100 observation years was analyzed using Poisson regression with exact tests. No adjustments were made for confounders.
b Overall comparison of all-cause revision per 100 observation years across groups, p = 0.7. No contrasts were performed because the overall test was not significant.
c Overall comparison of aseptic revision per 100 observation years across groups, p = 0.02. Contrasts: CoCr-Durasul vs. CoCr-Prolong, p = 0.6; CoCr-Other HXLPE vs. CoCr-Prolong, p = 0.9; CoCr-Sigma XLK vs. CoCr-Prolong, p = 0.009.
d Overall comparison of septic revision per 100 observation years across groups, p = 0.7. No contrasts were performed because the overall test was not significant.
e Number (%), reasons for revision (except for infection) are not mutually exclusive.
For other abbreviations, see Table 1.