Knee Surgery & Related Research : eISSN 2234-2451 / pISSN 2234-0726

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Fig. 4. (A) Comparison of locking plate systems: TomoFix (DePuy Synthes) and FlexitSystem (Neosteo). The number of threads at the plate and the screw head for the locking system is over 5 in TomoFix, which is larger than that in FlexitSystem. (B) The angle between the plate and the proximal screw was 11° in TomoFix, which was larger than 4° in FlexitSystem. (C) Mechanism of screw deviation with FlexitSystem. The mechanical axis after opening wedge high tibial osteotomy (HTO) passes the lateral eminence of the tibia, which is close to the tip of the locking pin. The large tibial plateau and proximal screw angle (PPSA) with FlexitSystem causes more stress than the small PPSA at the tip of the pin area. Moreover, hinge fracture may induce instability and pin back out.
Knee Surgery & Related Research 2018;30:171~175
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