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Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs?
BACKGROUND: The aim of total knee arthroplasty is, amongst others, the reconstruction of a physiological axis of the leg with a tibiofemoral angle in the frontal plane of an average of 6°. The aim of this study is to clarify how much of the bone length on the femur and tibia has to be reproduced on...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5071233/ https://www.ncbi.nlm.nih.gov/pubmed/27086139 http://dx.doi.org/10.1007/s10195-016-0404-0 |
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author | Sgroi, M. Faschingbauer, M. Reichel, H. Kappe, T. |
author_facet | Sgroi, M. Faschingbauer, M. Reichel, H. Kappe, T. |
author_sort | Sgroi, M. |
collection | PubMed |
description | BACKGROUND: The aim of total knee arthroplasty is, amongst others, the reconstruction of a physiological axis of the leg with a tibiofemoral angle in the frontal plane of an average of 6°. The aim of this study is to clarify how much of the bone length on the femur and tibia has to be reproduced on anteroposterior (AP) knee radiographs in order to determine the leg’s alignment after a total knee arthroplasty. MATERIALS AND METHODS: We analyzed the postoperative hip-to-ankle (HTA) radiographs of 100 patients who had undergone a total knee arthroplasty at our institution. RESULTS: There were strong correlations between the measured values on HTA and 20 cm bone length [lateral distal femur angle (LDFA) r = 0.887, medial proximal tibial angle (MPTA) r = 0.874, tibiofemoral angle (TFA) r = 0.888], but not between the measurements on HTA and 10 cm (LDFA r = 0.267, MPTA r = 0.102, TFA r = 0.161). There were significant differences between all measurements both on HTA and 20 cm and on HTA and 10 cm, with the exception of the LDFA between HTA and 10 cm (p = 0.085) and of the MPTA between HTA and 20 cm (p = 0.227). The intra- and inter-observer correlations were both high. CONCLUSION: If preoperatively crude axis deviations are excluded, the tibiofemoral angle on AP knee radiographs can be determined with an accuracy of ±2.6° if at least 20 cm length of bone is reproduced (measured from the femoral and tibial joint line). Due to the high 95 % confidence intervals and bearing in mind that deviations greater than 3° may lead to inferior clinical results, however, it appears inappropriate to determine lower limb alignment with anteroposterior radiographs. LEVEL OF EVIDENCE: Level 2. |
format | Online Article Text |
id | pubmed-5071233 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-50712332016-11-02 Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? Sgroi, M. Faschingbauer, M. Reichel, H. Kappe, T. J Orthop Traumatol Original Article BACKGROUND: The aim of total knee arthroplasty is, amongst others, the reconstruction of a physiological axis of the leg with a tibiofemoral angle in the frontal plane of an average of 6°. The aim of this study is to clarify how much of the bone length on the femur and tibia has to be reproduced on anteroposterior (AP) knee radiographs in order to determine the leg’s alignment after a total knee arthroplasty. MATERIALS AND METHODS: We analyzed the postoperative hip-to-ankle (HTA) radiographs of 100 patients who had undergone a total knee arthroplasty at our institution. RESULTS: There were strong correlations between the measured values on HTA and 20 cm bone length [lateral distal femur angle (LDFA) r = 0.887, medial proximal tibial angle (MPTA) r = 0.874, tibiofemoral angle (TFA) r = 0.888], but not between the measurements on HTA and 10 cm (LDFA r = 0.267, MPTA r = 0.102, TFA r = 0.161). There were significant differences between all measurements both on HTA and 20 cm and on HTA and 10 cm, with the exception of the LDFA between HTA and 10 cm (p = 0.085) and of the MPTA between HTA and 20 cm (p = 0.227). The intra- and inter-observer correlations were both high. CONCLUSION: If preoperatively crude axis deviations are excluded, the tibiofemoral angle on AP knee radiographs can be determined with an accuracy of ±2.6° if at least 20 cm length of bone is reproduced (measured from the femoral and tibial joint line). Due to the high 95 % confidence intervals and bearing in mind that deviations greater than 3° may lead to inferior clinical results, however, it appears inappropriate to determine lower limb alignment with anteroposterior radiographs. LEVEL OF EVIDENCE: Level 2. Springer International Publishing 2016-04-16 2016-12 /pmc/articles/PMC5071233/ /pubmed/27086139 http://dx.doi.org/10.1007/s10195-016-0404-0 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Original Article Sgroi, M. Faschingbauer, M. Reichel, H. Kappe, T. Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title | Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title_full | Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title_fullStr | Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title_full_unstemmed | Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title_short | Can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
title_sort | can the frontal tibiofemoral alignment be assessed on anteroposterior knee radiographs? |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5071233/ https://www.ncbi.nlm.nih.gov/pubmed/27086139 http://dx.doi.org/10.1007/s10195-016-0404-0 |
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