Journal
MEDICAL ENGINEERING & PHYSICS
Volume 42, Issue -, Pages 80-90Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2017.01.022
Keywords
Total ankle replacement; Fixation; Micromotion; Malpositioning; Finite element modelling
Categories
Funding
- British Orthopaedic Foot and Ankle Society [4243]
- EPSRC [EP/K027549/1]
- Wellcome Trust [088844/Z/09/Z]
- EPSRC [EP/K027549/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K027549/1] Funding Source: researchfish
- Wellcome Trust [088844/Z/09/Z] Funding Source: Wellcome Trust
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Implant loosening - commonly linked with elevated initial micromotion - is the primary indication for total ankle replacement (TAR) revision. Finite element modelling has not been used to assess micromodon of TAR implants; additionally, the biomechanical consequences of TAR malpositioning - previously linked with higher failure rates - remain unexplored. The aim of this study was to estimate implant-bone micromotion and peri-implant bone strains for optimally positioned and malpositioned TAR prostheses, and thereby identify fixation features and malpositioning scenarios increasing the risk of loosening. Finite element models simulating three of the most commonly used TAR devices (BOX (R), Mobility (R) and Salto (R)) implanted into the tibia/talus and subjected to physiological loads were developed. Mobility and Salto demonstrated the largest micromotion of all tibial and talar components, respectively. Any malpositioning of the implant creating a gap between it and the bone resulted in a considerable increase in micromotion and bone strains. It was concluded that better primary stability can be achieved through fixation nearer to the joint line and/or while relying on more than a single peg. Incomplete seating on the bone may result in considerably elevated implant-bone micromotion and bone strains, thereby increasing the risk for TAR failure. (C) 2017 The Authors. Published by Elsevier Ltd on behalf of IPEM.
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