Table I.
Explant patient demographics
| Characteristic | |
|---|---|
| Implants (n) | 91 |
| Mean age (yrs) (range) | 54 (29 to 68) |
| Male:female (n) | 38:53 |
| Mean time to revision (mths) (range) | 54 (8 to 108) |
| Device (n, %)* | |
| ASR | 73 (80.2) |
| BHR | 12 (13.2) |
| Durom | 3 (3.3) |
| Conserve Plus | 2 (2.2) |
| Cormet | 1 (1.1) |
| Reason for revision (n, %) | |
| ARMD† | 82 (90.1) |
| Avascular necrosis | 2 (2.2) |
| Loose acetabular component | 2 (2.2) |
| Unexplained pain | 2 (2.2) |
| Painful impingement | 1 (1.1) |
| Infection | 1 (1.1) |
| Uncomplicated femoral fracture | 1 (1.1) |
| Mean blood concentration (µg/l) (range) | |
| Chromium | 14.7 (1.24 to 123.2) |
| Cobalt | 16.0 (0.63 to 271.0) |
| Mean serum concentration (µg/l) (range)‡ | |
| Chromium | 17.9 (1.9 to 186.7) |
| Cobalt | 15.2 (0.96 to 235.4) |
| Mean volumetric bearing surface wear rate (mm3/yr) (range) | 7.35 (0.50 to 138.1) |
* ASR, Articulating Surface Replacement; BHR, Birmingham Hip Resurfacing † ARMD, adverse reaction to metal debris ‡ serum concentration values were only available for 78 patients