Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips

BACKGROUND: Limb length discrepancy (LLD) is one of the main cause of dissatisfaction after total hip arthroplasty (THA). The teardrop-lesser trochanter method can accurately predict and analyze LLD for healthy people. However, for patients with preoperative LLD, no method for predicting postoperati...

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Autores principales: Guo, Renwen, Chen, Jerry Yongqiang, Zhang, Guoqiang, Zhou, Yonggang, Chen, Jiying, Chai, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6827358/
https://www.ncbi.nlm.nih.gov/pubmed/31679510
http://dx.doi.org/10.1186/s12891-019-2903-7
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author Guo, Renwen
Chen, Jerry Yongqiang
Zhang, Guoqiang
Zhou, Yonggang
Chen, Jiying
Chai, Wei
author_facet Guo, Renwen
Chen, Jerry Yongqiang
Zhang, Guoqiang
Zhou, Yonggang
Chen, Jiying
Chai, Wei
author_sort Guo, Renwen
collection PubMed
description BACKGROUND: Limb length discrepancy (LLD) is one of the main cause of dissatisfaction after total hip arthroplasty (THA). The teardrop-lesser trochanter method can accurately predict and analyze LLD for healthy people. However, for patients with preoperative LLD, no method for predicting postoperative LLD is currently available, and these patients are highly susceptible to more severe LLD after THA. Accordingly, this study proposed a calculation method to predict postoperative limb length for these patients. METHODS: Eighty patients who underwent THA between May 2016 and October 2018 due to unilateral developmental dysplasia of the hip (DDH) were evaluated. Relevant parameters were measured from radiographs of full-length lower limbs, e.g. the distance between the rotation center of the hip and the midpoint of the tibial plafond and the distance between the point which was marked at the same height as the lesser trochanter on the anatomical long axis of the femur and the midpoint of the tibial plafond. Then, a mathematical model was established by simplifying the structure from the hip to the ankle. The relationship between the placement position of the prosthesis and the LLD value was calculated by Law of Sines and Iterative Calculation. RESULTS: The preoperatively predicted LLD values and the postoperatively measured LLD values were compared, yielding a mean absolute difference of 3.7 (range, 0.1 to 8.6) mm. The intraclass correlation coefficient (ICC) of the two parameters exhibited strong reliability (ICC = 0.911, 95%CI, 0.795 to 0.955). The Bland-Altman plot also showed good conformity between the two parameters. CONCLUSIONS: The proposed calculation method effectively predicted the postoperative LLD using preoperative parameters. Despite the complexity of the method, it can go a long way towards reducing the occurrence of severe postoperative LLD in DDH-THA.
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spelling pubmed-68273582019-11-07 Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips Guo, Renwen Chen, Jerry Yongqiang Zhang, Guoqiang Zhou, Yonggang Chen, Jiying Chai, Wei BMC Musculoskelet Disord Research Article BACKGROUND: Limb length discrepancy (LLD) is one of the main cause of dissatisfaction after total hip arthroplasty (THA). The teardrop-lesser trochanter method can accurately predict and analyze LLD for healthy people. However, for patients with preoperative LLD, no method for predicting postoperative LLD is currently available, and these patients are highly susceptible to more severe LLD after THA. Accordingly, this study proposed a calculation method to predict postoperative limb length for these patients. METHODS: Eighty patients who underwent THA between May 2016 and October 2018 due to unilateral developmental dysplasia of the hip (DDH) were evaluated. Relevant parameters were measured from radiographs of full-length lower limbs, e.g. the distance between the rotation center of the hip and the midpoint of the tibial plafond and the distance between the point which was marked at the same height as the lesser trochanter on the anatomical long axis of the femur and the midpoint of the tibial plafond. Then, a mathematical model was established by simplifying the structure from the hip to the ankle. The relationship between the placement position of the prosthesis and the LLD value was calculated by Law of Sines and Iterative Calculation. RESULTS: The preoperatively predicted LLD values and the postoperatively measured LLD values were compared, yielding a mean absolute difference of 3.7 (range, 0.1 to 8.6) mm. The intraclass correlation coefficient (ICC) of the two parameters exhibited strong reliability (ICC = 0.911, 95%CI, 0.795 to 0.955). The Bland-Altman plot also showed good conformity between the two parameters. CONCLUSIONS: The proposed calculation method effectively predicted the postoperative LLD using preoperative parameters. Despite the complexity of the method, it can go a long way towards reducing the occurrence of severe postoperative LLD in DDH-THA. BioMed Central 2019-11-03 /pmc/articles/PMC6827358/ /pubmed/31679510 http://dx.doi.org/10.1186/s12891-019-2903-7 Text en © The Author(s). 2019 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Guo, Renwen
Chen, Jerry Yongqiang
Zhang, Guoqiang
Zhou, Yonggang
Chen, Jiying
Chai, Wei
Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title_full Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title_fullStr Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title_full_unstemmed Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title_short Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips
title_sort calculation method to predict postoperative limb length in patients undergoing tha following developmental dysplasia of hips
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6827358/
https://www.ncbi.nlm.nih.gov/pubmed/31679510
http://dx.doi.org/10.1186/s12891-019-2903-7
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