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. 2015 Sep;27(3):181-6.
doi: 10.5792/ksrr.2015.27.3.181. Epub 2015 Sep 1.

Biomechanical Study of the Fixation Plates For Opening Wedge High Tibial Osteotomy

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Free PMC article

Biomechanical Study of the Fixation Plates For Opening Wedge High Tibial Osteotomy

Kug Jin Kim et al. Knee Surg Relat Res. .
Free PMC article

Abstract

Purpose: The purpose of this study was to compare the mechanical stability of three types of plate systems for opening wedge high tibial osteotomy.

Materials and methods: Forty-eight fresh frozen porcine tibia specimens were assigned to three different fixation device groups: Aescular group (16 specimens) was fixed with Aescular plates; Puddu group (16 specimens) with a Puddu plate, and TomoFix group (16 specimens) with a TomoFix plate. We compared axial displacements under compression loads from 200 to 2,000 N and maximal loads at failure among 8 specimens per group. We also compared displacements under cyclic load after 100 cycles at a compressive load of 2,000 N among 8 specimens per group.

Results: In all three groups, displacement under compression load increased with the increase in the axial compressive load; however, no significant intergroup differences were observed in the mean values under tested loading conditions. The mean maximal loads at failure were not significantly different (6,055, 6,798, and 6,973 N in the Aescular, Puddu, and TomoFix groups, respectively; p=0.41). While the TomoFix group showed less extension and strain during the cyclic load test, the mean values showed no significant differences among groups.

Conclusions: All three plate systems were found to provide fixation stability suitable for bearing axial compression and cyclic loads while walking.

Keywords: Biomechanical study; Fixation plate; High tibial osteotomy; Knee; Opening wedge.

Conflict of interest statement

Conflict of Interest: No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1
Fig. 1. Three plates for fixation of open wedge high tibial osteotomy: (A) Aescular plate, (B) Puddu plate, and (C) TomoFix plate.
Fig. 2
Fig. 2. Testing arrangement with axial loading of opening wedge high tibial osteotomy using mechanical testing system (Instron).
Fig. 3
Fig. 3. (A) Graph of axial compression load test. Failure load was defined as a drop of more than 30% of peak pressure. (B) Graph of compression/extension cyclic load test (2,000 N compression load).
Fig. 4
Fig. 4. (A) Degree of displacement at the time of failure. (B) Maximum load at the time of failure.

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