John Kyle Mueller , Charles Lawrie , Charlie Parduhn , Jeff Bischoff , Eik Siggelkow , Cory Trischler , Marc Bandi
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引用次数: 0
Abstract
Background
Initial stability of cementless total knee arthroplasty tibial trays is necessary for bony ingrowth. The purpose of this study was to characterize the patterns and magnitudes of displacement of three implant systems during physiological loading in terms of tibial tray movement and 3D micromotion.
Methods
Physiological loading (walking and stair descent) from a representative subject was robotically applied to cementless tibial trays implanted in foam tibia models. Three commercially available total knee arthroplasty systems with cementless tibial trays with keels and peripheral pegs from two different manufacturers were tested including symmetric, asymmetric and anatomically shaped tibial trays. Relative displacement between the foam tibia model and tibial tray in response to loading was measured at ten peripheral locations using an optical measurement system.
Findings
All systems showed inferior movement of the posterior tibial tray in response to posterior located tibiofemoral loading, and superior movement of the anterior tibial tray. The system with an anatomic tibial tray design had significantly less micromotion than the systems with an asymmetric and symmetric tibial tray designs during walking (symmetric: 229 ± 30 μm, asymmetric: 205 ± 54 μm, anatomic: 84 ± 22 μm; p < 0.001) and less micromotion than the symmetric tibial tray during stair descent (symmetric: 165 ± 17 μm, asymmetric: 151 ± 65 μm, anatomic: 92 ± 18 μm; p < 0.002).
Interpretation
Total knee arthroplasty system design had an impact on keeled cementless tibial tray initial stability during simulated walking and stair descent in this biomechanical model.
期刊介绍:
Clinical Biomechanics is an international multidisciplinary journal of biomechanics with a focus on medical and clinical applications of new knowledge in the field.
The science of biomechanics helps explain the causes of cell, tissue, organ and body system disorders, and supports clinicians in the diagnosis, prognosis and evaluation of treatment methods and technologies. Clinical Biomechanics aims to strengthen the links between laboratory and clinic by publishing cutting-edge biomechanics research which helps to explain the causes of injury and disease, and which provides evidence contributing to improved clinical management.
A rigorous peer review system is employed and every attempt is made to process and publish top-quality papers promptly.
Clinical Biomechanics explores all facets of body system, organ, tissue and cell biomechanics, with an emphasis on medical and clinical applications of the basic science aspects. The role of basic science is therefore recognized in a medical or clinical context. The readership of the journal closely reflects its multi-disciplinary contents, being a balance of scientists, engineers and clinicians.
The contents are in the form of research papers, brief reports, review papers and correspondence, whilst special interest issues and supplements are published from time to time.
Disciplines covered include biomechanics and mechanobiology at all scales, bioengineering and use of tissue engineering and biomaterials for clinical applications, biophysics, as well as biomechanical aspects of medical robotics, ergonomics, physical and occupational therapeutics and rehabilitation.