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The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions
AIMS: The cemented Oxford unicompartmental knee arthroplasty (OUKA) features two variants: single and twin peg OUKA. The purpose of this study was to assess the stability of both variants in a worst-case scenario of bone defects and suboptimal cementation. METHODS: Single and twin pegs were implante...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The British Editorial Society of Bone & Joint Surgery
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8882328/ https://www.ncbi.nlm.nih.gov/pubmed/35124977 http://dx.doi.org/10.1302/2046-3758.112.BJR-2020-0507.R2 |
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author | Eckert, Johannes Adrian Bitsch, Rudi G. Sonntag, Robert Reiner, Tobias Schwarze, Martin Jaeger, Sebastian |
author_facet | Eckert, Johannes Adrian Bitsch, Rudi G. Sonntag, Robert Reiner, Tobias Schwarze, Martin Jaeger, Sebastian |
author_sort | Eckert, Johannes Adrian |
collection | PubMed |
description | AIMS: The cemented Oxford unicompartmental knee arthroplasty (OUKA) features two variants: single and twin peg OUKA. The purpose of this study was to assess the stability of both variants in a worst-case scenario of bone defects and suboptimal cementation. METHODS: Single and twin pegs were implanted randomly allocated in 12 pairs of human fresh-frozen femora. We generated 5° bone defects at the posterior condyle. Relative movement was simulated using a servohydraulic pulser, and analyzed at 70°/115° knee flexion. Relative movement was surveyed at seven points of measurement on implant and bone, using an optic system. RESULTS: At the main fixation zone, the twin peg shows less relative movement at 70°/115°. At the transition zone, relative movements are smaller for the single peg for both angles. The single peg shows higher compression at 70° flexion, whereas the twin peg design shows higher compression at 115°. X-displacement is significantly higher for the single peg at 115°. CONCLUSION: Bony defects should be avoided in OUKA. The twin peg shows high resilience against push-out force and should be preferred over the single peg. Cite this article: Bone Joint Res 2022;11(2):82–90. |
format | Online Article Text |
id | pubmed-8882328 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The British Editorial Society of Bone & Joint Surgery |
record_format | MEDLINE/PubMed |
spelling | pubmed-88823282022-03-17 The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions Eckert, Johannes Adrian Bitsch, Rudi G. Sonntag, Robert Reiner, Tobias Schwarze, Martin Jaeger, Sebastian Bone Joint Res Biomechanics AIMS: The cemented Oxford unicompartmental knee arthroplasty (OUKA) features two variants: single and twin peg OUKA. The purpose of this study was to assess the stability of both variants in a worst-case scenario of bone defects and suboptimal cementation. METHODS: Single and twin pegs were implanted randomly allocated in 12 pairs of human fresh-frozen femora. We generated 5° bone defects at the posterior condyle. Relative movement was simulated using a servohydraulic pulser, and analyzed at 70°/115° knee flexion. Relative movement was surveyed at seven points of measurement on implant and bone, using an optic system. RESULTS: At the main fixation zone, the twin peg shows less relative movement at 70°/115°. At the transition zone, relative movements are smaller for the single peg for both angles. The single peg shows higher compression at 70° flexion, whereas the twin peg design shows higher compression at 115°. X-displacement is significantly higher for the single peg at 115°. CONCLUSION: Bony defects should be avoided in OUKA. The twin peg shows high resilience against push-out force and should be preferred over the single peg. Cite this article: Bone Joint Res 2022;11(2):82–90. The British Editorial Society of Bone & Joint Surgery 2022-02-07 /pmc/articles/PMC8882328/ /pubmed/35124977 http://dx.doi.org/10.1302/2046-3758.112.BJR-2020-0507.R2 Text en © 2022 Author(s) et al. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (CC BY-NC-ND 4.0) licence, which permits the copying and redistribution of the work only, and provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc-nd/4.0/ |
spellingShingle | Biomechanics Eckert, Johannes Adrian Bitsch, Rudi G. Sonntag, Robert Reiner, Tobias Schwarze, Martin Jaeger, Sebastian The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title | The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title_full | The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title_fullStr | The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title_full_unstemmed | The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title_short | The primary stability of the femoral component in cemented single and twin peg Oxford unicompartmental knee arthroplasty under adverse conditions |
title_sort | primary stability of the femoral component in cemented single and twin peg oxford unicompartmental knee arthroplasty under adverse conditions |
topic | Biomechanics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8882328/ https://www.ncbi.nlm.nih.gov/pubmed/35124977 http://dx.doi.org/10.1302/2046-3758.112.BJR-2020-0507.R2 |
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