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Updated: Jul 30, 2026
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Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees
Published on: July 15, 2009
[Biomechanics of new implants for HTO].
D Pape1,2, A Diffo Kaze3,4, A Hoffmann5,6
1Orthopädische Klinik des Centre Hospitalier de Luxembourg, Akademisches Lehrkrankenhaus der Universitätskliniken des Saarlandes, 78, rue d'Eich, 1460, Luxembourg, Luxemburg. dietrichpape@yahoo.de.
Der Orthopade
|April 12, 2017
Summary
The ContourLock® and iBalance® tibial osteotomy plates demonstrated superior fatigue strength in biomechanical testing for knee osteoarthritis treatment. Plate design, particularly wider proximal T-shapes with diverging screws, enhances mechanical performance.
Area of Science:
- Orthopedic biomechanics
- Biomaterials engineering
Background:
- Medial knee joint osteoarthritis necessitates surgical intervention, often involving high tibial osteotomy.
- Tibial osteotomy plates are crucial for stabilizing bone fragments during healing.
- Understanding the biomechanical performance of different plate designs is essential for optimizing treatment outcomes.
Purpose of the Study:
- To compare the biomechanical characteristics of five different tibial osteotomy plates used in medial open-wedge high tibial osteotomy.
- To evaluate the static and cyclic fatigue strength of these implants under simulated physiological loading conditions.
Main Methods:
- Fifth-generation tibial bone composites were subjected to medial open-wedge high tibial osteotomy using five distinct plate designs: TomoFix™ standard, PEEKPower®, ContourLock®, TomoFix™ small stature, and iBalance®.
- Static compression load to failure tests were conducted.
- Load-controlled cyclic fatigue failure tests were performed to assess durability.
Main Results:
- All tested plates exhibited sufficient stability under static compression loads up to 2400 N.
- Screw breakage and cortex fractures occurred at lower loads in specific groups.
- The ContourLock® and iBalance® implants demonstrated the highest fatigue strength, enduring the greatest maximal load and number of cycles.
- PEEKPower®, TomoFix™ standard, and TomoFix™ small stature plates showed lower fatigue resistance.
- Wider T-shaped proximal designs with diverging screws correlated with increased mechanical strength.
Conclusions:
- While all plates offer adequate static stability, significant differences exist in cyclic fatigue performance.
- Plate designs featuring a wider proximal T-shape and diverging screws (ContourLock®, iBalance®) exhibit superior mechanical fatigue strength.
- Narrower T-shaped designs or short vertical plates may compromise fatigue resistance, potentially impacting long-term clinical success.
