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Biomechanical comparison of the wedge supported plates at PTO

Yardimeden A., Kelestemur M. H., Esenkaya I.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 8

495-498

Purpose: Proximal tibial osteotomy (PTO) is a widely used surgical procedure for the treatment in medial compartment osteoarthritis of the knee with mal-alignment, particularly in young and active patients. Several types of plates are developed recently at the medial opening wedge osteotomy technique. The main aim of this study is to make stress analysis and compare the stability of a commonly used anatomic "T" plate and 3 different wedge supported plates and their combinations which are designed by one of the author of this article. Design/methodology/approach: In this biomechanical study, calf tibial models were used in order to compare the stability of the plates under axial compression loading. 2 and 4 holes rectangular shape wedge supported plates, 4 holes reversed "L" shape wedge supported plates or combination of these and 6 holes anatomic "T" plates were used for the models. The compression behaviour of the model was tested by using a universal mechanical testing machine. And, a numerical method, ANSYS finite element code, was used for the stress analysis of the plates. Findings: The specimen fixed with the combination of 4 holes reversed "L" shapes and 2 holes rectangular shape plates and 6 holes anatomic "T" plates showed significantly better stability than those of others. The numerical and experimental results were well agreed. Practical implications: When Ti alloy plate is compared with stainless steel plate it is observed that the stress values do not change under applied loads and it does not show an advantage in term of stress. However, literature indicates that it has higher fatigue life and better electro-chemical properties. Originality/value: Biomechanical comparison of the wedge supported plates at proximal tibial osteotomy.