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Table 1 The failure types used and their defining criteria

From: Biomechanical properties of five different currently used implants for open-wedge high tibial osteotomy

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