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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)

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

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  
  1. There were no cracks observed prior to the ultimate failure in the case of PEEKPower 1, iBalance 1 & 2 (all values rounded to the 1st decimal)