Table 3 Static tests summary: displacements, valgus malrotation of the tibial head and their corresponding cracks and ultimate loads, including mean values and standard deviations (SD)
Specimen | Crack / ultimate load [kN] | Medial displ. at crack / ultimate load [mm] | Lateral displ. at crack / ultimate load [mm] | Valgus malrotation of the tibial head at crack / ultimate load (°) | Lateral stiffness at crack / ultimate load [kN/mm] | Failure types |
|---|---|---|---|---|---|---|
TomoFix std 1 | 4.1 / 5.4 | 0.6 / 1.2 | 3.1 / 5.0 | 1.8 / 2.9 | 1.3 / 1.1 | 1 and 2 |
TomoFix std 2 | 5.1 / 5.2 | 1.0 / 1.1 | 4.2 / 4.4 | 2.5 / 2.6 | 1.2 / 1.2 | 1 and 2 |
Mean: | 4.6 / 5.3 | 0.8 / 1.2 | 3.7 / 4.7 | 2.1 / 2.8 | 1.3 / 1.1 | |
SD ±: | 0.7 / 0.1 | 0.3 / 0.1 | 0.8 / 0.4 | 0.5 / 0.2 | 0.1 / 0.1 | |
PEEKPower 1 | -/ 3.7 | -/ 0.5 | -/ 2.9 | -/ 1.6 | -/ 1.3 | 1 and 2 |
PEEKPower 2 | 4.2 / 5.1 | 0.1 / 0.1 | 2.7 / 3.3 | 1.3 / 1.5 | 1.6 / 1.5 | 1 and 2 |
Mean: | -/ 4.4 | -/ 0.3 | -/ 3.1 | -/ 1.6 | -/ 1.4 | |
SD ±: | -/ 0.1 | -/ 0.3 | -/ 0.3 | -/ 0.1 | -/ 0.1 | |
iBalance 1 | -/ 5.7 | -/ 0.3 | -/ 1.6 | -/ 0.6 | -/ 3.6 | 2 |
iBalance 2 | -/ 5.4 | -/ 0.3 | -/ 2.1 | -/ 1.1 | -/ 2.6 | 2 |
Mean: | -/ 5.5 | -/ 0.3 | -/ 1.9 | -/ 0.9 | -/ 3.1 | |
SD ±: | -/ 0.2 | -/ 0 | -/ 0.4 | -/ 0.4 | -/ 0.7 | |
TomoFix sm 1 | 3.1 / 3.2 | 0.6 / 0.9 | 1.3 / 1.8 | 0.9 / 1.3 | 2.4 / 1.8 | 2 |
TomoFix sm 2 | 3.2 / 3.6 | 0.4 / 0.6 | 1.6 / 2.3 | 0.9 / 1.4 | 2.0 / 1.6 | 2 |
Mean: | 3.2 / 3.4 | 0.5 / 0.8 | 1.5 / 2.1 | 0.9 / 1.4 | 2.2 / 1.7 | |
SD ±: | 0.1 / 0.3 | 0.1 / 0.2 | 0.2 / 0.4 | 0 / 0.1 | 0.3 / 0.1 | |
ContourLock 1 | 2.4 / 3.2 | 0.6 / 0.5 | 2.5 / 3.9 | 1.5 / 2.1 | 1.0 / 0.8 | 1 and 2 |
ContourLock 2 | -/ 3.9 | -/ 0.5 | -/ 4.2 | -/ 2.2 | -/ 0.9 | 1 and 2 |
Mean: | -/ 3.6 | -/ 0.5 | -/ 4.1 | -/ 2.2 | -/ 0.9 | |
SD ±: | -/ 0.5 | -/ 0 | -/ 0.2 | -/ 0.1 | -/ 0.1 |