Equivalent 2-year stabilization of uncemented tibial component migration despite higher early migration compared with cemented fixation: an RSA study on 360 total knee arthroplasties |
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| Authors: | Elise K Laende Janie L Astephen Wilson Joanna Mills Flemming Edward R Valstar C Glen Richardson Michael J Dunbar |
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| Affiliation: | 1. School of Biomedical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada;2. ;3. Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada;4. Department of Surgery, Dalhousie University, Halifax, Nova Scotia, Canada;5. Department of Mathematics and Statistics, Dalhousie University, Halifax, Nova Scotia, Canada;6. Department of Orthopedics, Leiden University Medical Center, Leiden, The Netherlands;7. Division of Orthopaedics, Department of Surgery, Dalhousie University and QEII Health Sciences Centre, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada |
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| Abstract: | ![]()
Background and purpose — Thresholds of implant migration for predicting long-term successful fixation of tibial components in total knee arthroplasty have not separated cemented and uncemented fixation. We compared implant migration of cemented and uncemented components at 1 year and as the change in migration from 1 to 2 years.Patients and methods — Implant migration of 360 tibial components measured using radiostereometric analysis was compared at 1 year and as the change in migration from 1 to 2 years in 222 cemented components (3 implant designs) and 138 uncemented components (5 implant designs).Results — 1-year maximum total point motion was lower for the cemented tibial components compared with the uncemented components (median = 0.31?mm [0.03–2.98] versus 0.63?mm [0.11–5.19] respectively, p < 0.001, mixed model). The change in migration from 1 to 2 years, however, was equivalent for cemented and uncemented components (mean [SD] 0.06?mm [0.19] and 0.07?mm [0.27] mm respectively, p = 0.6, mixed model).Interpretation — These findings suggest that current thresholds of acceptable migration at 1 year may be better optimized by considering cemented and uncemented tibial components separately as higher early migration of uncemented components was not associated with decreased stability from 1 to 2 years. |
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