Table 4 Used failure types and their defining criteria (Maas et al. 2013; Diffo Kaze et al. 2015; Diffo Kaze 2016; Diffo Kaze et al. 2017)
Failure type | Criteria |
|---|---|
1 | Medial or lateral displacements of the tibial head in relation to the tibial shaft of more than 2 mm, equivalent to a rotation of more than 1.4 °. A counter-clockwise rotation corresponds to a valgus malrotation of the tibia head. This criterion can only be checked in the unloaded condition. |
2 | Visible collapse of lateral cortex. Small hairline cracks are not considered as failure. |
3 | Maximal displacement range of more than 0.5 mm within one hysteresis loop in the case of cyclic testing only. |
4 | Cracks of the screws of more than 1 mm |