Concept of the interaction of frictional forces and strength application needed for bending/breaking the tibia metaphysis. Both constructions are designed to provide surface contact for the tibia at the same height. A) Frictional forces are created (small green arrows) when, through the axial lengthening of the tibia diaphysis, the distal tibia moves across the metal plate (star) and thus a larger force for bending/breaking is needed (large red arrow). B) Frictional forces are eliminated through the mobile, ball-mounted platform (blue double arrow) and less force is needed (orange arrow) to bend/break the tibia metaphysis.
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