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Table 2 Different HTO implants considered in the study (Groups IV to VII)

From: Mechanical strength of a new plate compared to six previously tested opening wedge high tibial osteotomy implants

GroupsImplant pictureMaterialDesign/fixation principle
TomoFix sm (Group IV)TitaniumSame fixation principle with the TomoFix std. Geometry adapted from the TomoFix std. to patient with small stature
ContourLock (Group V)TitaniumShort spacer plate with large proximal part and angle stable multidirectional screws.
The proximal screws are monocortical and fixed in the cancellous bone and the distal screws are bicortical.
Activmotion (Group VI)Titanium alloyInternal fixator with eight monoaxial locking screws. The diaphyseal screws are bicortical while the epiphyseal are monocortical
FlexitSystem (Group VII)Titanium alloyT-shaped internal fixator, shorter than the TomoFix plates, with angle stable unidirectional screws. The proximal screws are monocortical and fixed in the cancellous bone and the distal screws are bicortical.
  1. The implants have different shapes. All the implants are centred onto the medial surface of the tibia head, except for the size 2 Activmotion that is positioned onto the antero-medial side of the tibia head