Table 2.
Wear rates of MOM bearing couples defined in different units
| Type of wear | Wear rate | Method | Ref. |
|---|---|---|---|
| Linear wear rate of femoral heads per year | 7.6 μm (range 2.9–13) to | Explanted implant(s) | Reinisch et al. (2003) |
| 250 μm (range 50–810) | Radiographic analysis | Stilling et al. (2009) | |
| First year | 25 μm | Explanted implant(s) | Sieber et al. (1999) |
| > 3 years | 5 μm | Explanted implant(s) | Sieber et al. (1999 |
| Volumetric wear rate of femoral heads per year | 2.0 mm3 (range 0.55–3.7) | Explanted implant(s) | Reinisch et al. (2003) |
| 5.0 mm3 (range 0.22–22) | Explanted implant(s) | Willert et al. (1996) | |
| Mass wear rate per year | 17 mg (range 4.6–31) | Explanted implant(s) | Reinisch et al. (2003) |
| No. of particles per unit volume of wear per mm3 | 2.7 × 1012 – 1.5 × 1013 | Pin-on-plate | Tipper et al. (1999) |
| Number of particles per 106 cycles | 4 × 1012 – 6 × 1013 | Pin-on-plate | Tipper et al. (1999) |
| Number of particles per year | 6.7 × 1012 – 2.5 × 1014 | Explanted implant(s) | Doorn et al. (1998) |
Note: Retrieval study data were obtained from patients undergoing revision of THAs with MOM bearing couples. Radiographic wear analysis was performed by analysis of digitized anteroposterior (AP) radiographs using a computerized method.