Table 2.

Used failure types and their defining criteria.

Failure type	Criteria
1	Visible yielding and dislocation/tilt of the tibia plateau of more than 2 mm. This criterion can only be checked in the unloaded condition and addresses the unwanted loss of correction after surgery.
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.