1. Influence of varying stem and metaphyseal sleeve size on the primary stability of cementless revision tibial trays used to reconstruct AORI IIA defects. A simulation study
- Author
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Heldreth Mark A, Maged Awadalla, Lucian B. Solomon, Mark Taylor, Dermot O'Rourke, and Rami M. A. Al-Dirini
- Subjects
Orthodontics ,030222 orthopedics ,Tibial tray ,business.industry ,0206 medical engineering ,Total knee replacement ,02 engineering and technology ,020601 biomedical engineering ,03 medical and health sciences ,0302 clinical medicine ,Strain distribution ,Medicine ,Orthopedics and Sports Medicine ,Implant ,Tibia ,Component fixation ,business - Abstract
Traditionally, diaphyseal stems have been utilized to augment the stability of revision total knee replacement (rTKR) implants. More recently metaphyseal augments, such as sleeves, have been introduced to further augment component fixation. The effect of augments such as stems and sleeves have on the primary stability of a rTKR implant is poorly understood, however it has important implications on the complexity, costs and survivorship of the procedure. Finite element analysis was used to investigate the primary stability and strain distribution of various size stems and sleeves used in conjunction with a cementless revision tibial tray. The model was built from computer tomography images of a single healthy tibia obtained from an 81-year-old patient to which an Anderson Orthopaedic Research Institute (AORI) IIA defect was virtually added. The influences of varying body mass index (BMI) and bone modulus were also investigated. Stemless sleeves were found to provided adequate primary implant stability (average implant micro-motion
- Published
- 2018