26 research outputs found
Survivorship and Clinical Outcome of the Minimally Invasive Uniglide Medial Fixed Bearing, All-polyethylene Tibia, Unicompartmental Knee Arthroplasty at a Mean Follow-up of 7.3 Years
Background: Medial UKA performed in England and Wales represents 7 to 11% of all knee arthroplasty procedures, and is most commonly performed using mobile-bearing designs.
Fixed bearing eliminates the risk of bearing dislocation, however some studies have shown higher revision rates for all-polyethylene tibial components compared to those that utilize metal-backed implants. The aim of the study is to analyse survivorship and maximum 8-year clinical outcome of medial fixed bearing, Uniglide unicompartmental knee arthroplasty performed using an all-polyethylene tibial component with a minimal invasive approach.
Methods: Between 2002 and 2009, 270 medial fixed UKAs were performed in our unit. Patients were reviewed pre-operatively, 5 and 8 years post-operatively. Clinical and radiographic reviews were carried out. Patients’ outcome scores (Oxford, WOMAC and American Knee Score) were documented in our database and analysed.
Results: Survival and clinical outcome data of 236 knees with a mean 7.3 years follow-up are reported. Every patient with less than 4.93 years follow-up underwent a revision. The patients’ average age at the time of surgery was 69.5 years. The American Knee Society Pain and Function scores, the Oxford Knee Score and the WOMAC score all improved significantly. The 5 years survival rate was 94.1% with implant revision surgery as an end point. The estimated 10 years survival rate is 91.3%. 14 patients were revised before the 5 year follow-up.
Conclusion: Fixed bearing Uniglide UKA with an all-polyethylene tibial component is a valuable tool in the management of a medial compartment osteoarthritis, affording good short term survivorship
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Near-field characteristics of a turbulent coflowing jet
The near-field evolution of the velocity and concentration fields for an axisymmetric jet flow of CFC-12 issuing into a coannular jet flow of air is presented. Results based on measurements of the time resolved velocity (two components) and (separately) the concentration, obtained using laser anemometry and Rayleigh scattering systems, show that the transport of momentum and mass in the near field depends on the large scale structure which forms in the shear layer at the edge of the jet. The type of instability and hence the flow development is shown to depend primarily on the ratio of the coflow to jet velocity (m), density ratio, and the jet exit velocity profile. Specifically, for velocity ratios less than and greater than unity, the statistical properties of the velocity and concentration fields are compatible with the existence of an annular vortex ring with positive vorticity for m < 1 and negative vorticity for m > 1. For a velocity ratio equal to unity, the results are consistent with the presence of pairs of counter-rotating vortices that are typical of a wake flow. © 1990 American Institute of Aeronautics and Astronautics, Inc., All rights reserved
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Near-field characteristics of a turbulent coflowing jet
The near-field evolution of the velocity and concentration fields for an axisymmetric jet flow of CFC-12 issuing into a coannular jet flow of air is presented. Results based on measurements of the time resolved velocity (two components) and (separately) the concentration, obtained using laser anemometry and Rayleigh scattering systems, show that the transport of momentum and mass in the near field depends on the large scale structure which forms in the shear layer at the edge of the jet. The type of instability and hence the flow development is shown to depend primarily on the ratio of the coflow to jet velocity (m), density ratio, and the jet exit velocity profile. Specifically, for velocity ratios less than and greater than unity, the statistical properties of the velocity and concentration fields are compatible with the existence of an annular vortex ring with positive vorticity for m < 1 and negative vorticity for m > 1. For a velocity ratio equal to unity, the results are consistent with the presence of pairs of counter-rotating vortices that are typical of a wake flow. © 1990 American Institute of Aeronautics and Astronautics, Inc., All rights reserved