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Clin Orthop Surg. 2016 Dec;8(4):373-378. Epub 2016 Nov 4.

Biomechanical Analysis of a Novel Wedge Locking Plate in a Porcine Tibial Model.

Author information

1
Department of Orthopedic Surgery, Seoul Paik Hospital, University of Inje College of Medicine, Seoul, Korea.
2
Department of Biomedical Engineering, Inje University, Gimhae, Korea.
3
Trauma & Orthopaedics, Medway NHS Trust, Kent, UK.
4
Department of Orthopaedic Surgery, Konkuk University School of Medicine, Seoul, Korea.

Abstract

BACKGROUND:

The purpose of this study was to analyze biomechanical properties of a novel wedge locking plate in medial open wedge high tibial osteotomy (OWHTO) in a porcine tibial model.

METHODS:

A uniform 8-mm OWHTO was performed in 12 porcine tibiae. Six of them were subsequently fixed with the plate without a wedge, whereas the other 6 were additionally reinforced with a metal wedge of 8 mm. Biomechanical properties (stiffness, displacement of the osteotomy gap, and failure load) were evaluated under axial load. The different modes of failure were also investigated.

RESULTS:

The plate showed an axial stiffness of 2,457 ± 450 N/mm with a wedge and 1,969 ± 874 N/mm without a wedge. The maximum failure load was 5,380 ± 952 N with a wedge and 4,354 ± 607 N without a wedge. The plate with a wedge had a significantly greater failure load and significantly less displacement of medial gap at failure than that without a wedge (p = 0.041 and p = 0.002, respectively). The axial stiffness was not different between the two types of fixation. Most failures were caused by lateral cortex breakage and there was no implant failure.

CONCLUSIONS:

The novel wedge locking plate showed excellent biomechanical properties and an additional wedge provided significant improvement. This plate can be a good fixation method for OWHTO.

KEYWORDS:

High tibial osteotomy; Knee; Open wedge osteotomy

PMID:
27904718
PMCID:
PMC5114248
DOI:
10.4055/cios.2016.8.4.373
[Indexed for MEDLINE]
Free PMC Article

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