Joint contact characteristics in agility total ankle arthroplasty

Clinical Orthopaedics and Related Research
James J NicholsonMark S Myerson

Abstract

High component contact pressures in total joint prostheses can lead to particle wear debris and prosthesis loosening. The contact pressures in the Agility total ankle prosthesis have not been investigated. In the current study, a cadaveric model was used to evaluate contact characteristics (average contact area, contact pressure, and contact peak pressures) for the Agility total ankle system. Ten cadaveric specimens were implanted with the Agility total ankle and axially loaded to 700 N. The average contact pressure of the system was 5.6 MPa with mean peak pressures of 21.2 MPa. In a separate phase of the study, contact characteristics with applied loads for each of the six component sizes showed a significant effect of component size on contact characteristics. When physiologic ankle forces are considered for normal patient activity, peak pressures observed in the current study may exceed recommended contact pressures (10 MPa) and the compressive yield point (13-22 MPa) for polyethylene. A heavy patient with a small ankle would not be expected to have a good outcome based on the current contact pressures data, whereas a heavy patient with a larger ankle might be a better candidate for surgery.

References

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Citations

May 11, 2016·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Tassos NatsakisJos Vander Sloten
Sep 17, 2009·Foot & Ankle International·Zachary VaupelPaul T Fortin
Sep 17, 2009·Foot & Ankle International·Richard J Claridge, Bernard H Sagherian
May 5, 2010·The Journal of Bone and Joint Surgery. American Volume·N EspinosaJ G Snedeker
May 3, 2006·The Journal of Bone and Joint Surgery. American Volume·B A LevyP A Cole
Jul 28, 2021·International Journal for Numerical Methods in Biomedical Engineering·Yousef TaghizadehGholamreza Rouhi
May 18, 2010·Clinics in Podiatric Medicine and Surgery·Lawrence A DiDomenicoLaurence Z Cain

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