Table 1 The failure types used and their defining criteria
Failure type | Criteria |
|---|---|
1 | Medial or lateral displacements of the tibial head in relation to the tibial shaft greater than 2 mm. This criterion can only be checked in the unloaded condition. |
2 | Visible collapse of the lateral cortex. Small hairline cracks are not considered as failure. |
3 | Maximal displacement range greater than 0.5 mm within one hysteresis loop in the case of cyclic testing only. |
4 | Cracks of the screws greater than 1 mm |