Patient demographics
| <1 (low wear) | 1–2 (low/expected wear) | 2–5 (equivocal) | 5–10 (increased wear) | >10 (excessive wear) | |
|---|---|---|---|---|---|
| Number of patients | 57 | 95 | 76 | 25 | 46 |
| Number of BHR hips | 4 | 29 | 12 | 2 | 6 |
| Time from op to venesection | 49 (44–52) | 52 (44–68) | 52 (42–68) | 55 (52–58) | 54 (42–68) |
| Number of ASR hips | 53 | 66 | 64 | 23 | 39 |
| Time from op to venesection | 30 (4–67) | 28 (7–62) | 33 (12–73) | 30 (12–67) | 34 (12–70) |
| Mean age at primary (range) | 55 (28–78) | 55 (28–73) | 57 (39–78) | 59 (45–69) | 54 (35–68) |
| Number of female hips (%) | 15 (26.3) | 29 (30.5) | 26 (33.8) | 15 (62.5) | 18 (43.9) |
| Number (%) of hips revised for ARMD within 9 years of surgery | 0 | 1 (1.1) | 4 (5.3) | 5 (20.0) | 30 (65.2) |
The patients have been subdivided according to the classifications described in table 2.
ARMD, adverse reaction to metal debris; ASR, Articular Surface Replacement; BHR, Birmingham Hip Resurfacing.