Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction.
<h4>Introduction</h4>The impact of medial unicompartmental knee arthroplasty (MUKA) on ankle alignment is not well-studied. This study aims to investigate the changes in ankle alignment following MUKA and identify the influencing factors.<h4>Materials and methods</h4>A retros...
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2025-01-01
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| Online Access: | https://doi.org/10.1371/journal.pone.0318677 |
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| author | Han-Ting Shih Shun-Ping Wang Cheng-Hung Lee Kao-Chang Tu Shih-Chieh Tang Kun-Hui Chen |
| author_facet | Han-Ting Shih Shun-Ping Wang Cheng-Hung Lee Kao-Chang Tu Shih-Chieh Tang Kun-Hui Chen |
| author_sort | Han-Ting Shih |
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| description | <h4>Introduction</h4>The impact of medial unicompartmental knee arthroplasty (MUKA) on ankle alignment is not well-studied. This study aims to investigate the changes in ankle alignment following MUKA and identify the influencing factors.<h4>Materials and methods</h4>A retrospective analysis included 175 patients undergoing MUKA between 2018 and 2020. Patients were categorized into varus (n = 113) or valgus (n = 62) ankle groups based on preoperative ankle deformities. Preoperative and postoperative full-length standing radiographs were used for radiographic measurements.<h4>Results</h4>Following MUKA, significant differences in the change in tibial plafond-talus angle (PTA) were observed between the groups, with the varus ankle group showing a change of -0.71 ± 0.82° and the valgus ankle group showing a change of 0.08 ± 0.94° (p < 0.001). In the varus ankle group, the tibial plafond-ground angle (PGA) increased from -3.65 ± 4.22° preoperatively to -0.51 ± 4.52° postoperatively (p < 0.001), talus-ground angle (TGA) increased from -5.28 ± 4.32° to -1.32 ± 4.74° (p < 0.001), and PTA decreased from 1.52 ± 1.04° to 0.81 ± 1.12° (p < 0.001). In the valgus ankle group, PGA increased from -5.44 ± 4.39° to -1.43 ± 4.63° (p < 0.001) and TGA increased from -4.55 ± 4.24° to -0.59 ± 4.47° (p < 0.001), but PTA did not show a significant change. Ankle alignment change significantly correlated with preoperative joint line convergence angle (JLCA), preoperative medial proximal tibial angle (MPTA), preoperative PGA, preoperative TGA, preoperative PTA, hip-knee-ankle angle (HKA) changes, and bearing thickness.<h4>Conclusions</h4>MUKA significantly corrects the majority of ankle alignment towards a more neutral position. The extent of ankle alignment correction is influenced by preoperative knee and ankle joint deformities, as well as the degree of knee alignment correction. |
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| institution | Kabale University |
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| publishDate | 2025-01-01 |
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| spelling | doaj-art-e3a470364da14e27a85d997f6d7e81dd2025-08-20T03:47:45ZengPublic Library of Science (PLoS)PLoS ONE1932-62032025-01-01203e031867710.1371/journal.pone.0318677Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction.Han-Ting ShihShun-Ping WangCheng-Hung LeeKao-Chang TuShih-Chieh TangKun-Hui Chen<h4>Introduction</h4>The impact of medial unicompartmental knee arthroplasty (MUKA) on ankle alignment is not well-studied. This study aims to investigate the changes in ankle alignment following MUKA and identify the influencing factors.<h4>Materials and methods</h4>A retrospective analysis included 175 patients undergoing MUKA between 2018 and 2020. Patients were categorized into varus (n = 113) or valgus (n = 62) ankle groups based on preoperative ankle deformities. Preoperative and postoperative full-length standing radiographs were used for radiographic measurements.<h4>Results</h4>Following MUKA, significant differences in the change in tibial plafond-talus angle (PTA) were observed between the groups, with the varus ankle group showing a change of -0.71 ± 0.82° and the valgus ankle group showing a change of 0.08 ± 0.94° (p < 0.001). In the varus ankle group, the tibial plafond-ground angle (PGA) increased from -3.65 ± 4.22° preoperatively to -0.51 ± 4.52° postoperatively (p < 0.001), talus-ground angle (TGA) increased from -5.28 ± 4.32° to -1.32 ± 4.74° (p < 0.001), and PTA decreased from 1.52 ± 1.04° to 0.81 ± 1.12° (p < 0.001). In the valgus ankle group, PGA increased from -5.44 ± 4.39° to -1.43 ± 4.63° (p < 0.001) and TGA increased from -4.55 ± 4.24° to -0.59 ± 4.47° (p < 0.001), but PTA did not show a significant change. Ankle alignment change significantly correlated with preoperative joint line convergence angle (JLCA), preoperative medial proximal tibial angle (MPTA), preoperative PGA, preoperative TGA, preoperative PTA, hip-knee-ankle angle (HKA) changes, and bearing thickness.<h4>Conclusions</h4>MUKA significantly corrects the majority of ankle alignment towards a more neutral position. The extent of ankle alignment correction is influenced by preoperative knee and ankle joint deformities, as well as the degree of knee alignment correction.https://doi.org/10.1371/journal.pone.0318677 |
| spellingShingle | Han-Ting Shih Shun-Ping Wang Cheng-Hung Lee Kao-Chang Tu Shih-Chieh Tang Kun-Hui Chen Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. PLoS ONE |
| title | Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. |
| title_full | Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. |
| title_fullStr | Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. |
| title_full_unstemmed | Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. |
| title_short | Factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty: Preoperative knee and ankle deformities and extent of knee alignment correction. |
| title_sort | factors influencing ankle alignment changes following medial unicompartmental knee arthroplasty preoperative knee and ankle deformities and extent of knee alignment correction |
| url | https://doi.org/10.1371/journal.pone.0318677 |
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