Table 2.
Time to and cause for revisions
| Factor | Years to revision |
Cobalt (µg/L) |
Chromium (µg/L) |
Titanium (µg/L) |
ALTR grade a |
|---|---|---|---|---|---|
| Modular: | |||||
| Infection | 1.9 | n/a | n/a | n/a | n/a |
| Loose cup | 3.6 | 3.3 | 1.0 | 1.7 | n/a |
| Loose cup | 4.3 | 3.8 | 1.7 | 0.5 | n/a |
| PPFF b | 5.8 | 3.0 | 0.9 | 2.8 | 4 |
| PPFF | 6.4 | 5.4 | 1.9 | 0.5 | 0 |
| ALTR c | 6.4 | 8.2 | 2.4 | 1.3 | 3 |
| PPFF | 7.1 | 9.3 | 1.8 | 0.5 | 1 |
| Loose stem | 7.8 | 4.8 | 1.1 | 0.5 | 1 |
| Standard: | |||||
| Infection | 1.4 | n/a | n/a | n/a | n/a |
ALTR: Adverse local tissue reaction .
PPFF: Periprosthetic femoral fracture.
a At 5 years’ follow-up.
b Accompanying groin pain prior to PPFF.
c ALTR type 3. Skin reaction with proved hypersensitivity to cobalt. Accompanying groin pain.