ArticleKnee surgery & related research2024
Preserving coronal knee alignment of the knee (CPAK) in unicompartmental knee arthroplasty correlates with superior patient-reported outcomes.
Article in Knee surgery & related research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.
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Who cites it
14 citing papers in PubMed, 1 synthesis or guideline pooled it, 21 citations in OpenAlex.
- There is no standardised measurement approach for medial proximal tibial angle after unicompartmental knee arthroplasty: A systematic review.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026Pooled it
- Joint line obliquity change was associated with femoral and tibial resection patterns and smaller final flexion imbalance after robot-assisted total knee arthroplasty.Journal of experimental orthopaedics · 2026Article
- [Impact of coronal plane alignment of knee phenotype alteration on short-term effectiveness in robot-assisted total knee arthroplasty].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2026Article
- Does the preoperative CPAK classification influence clinical outcomes after medial and lateral unicompartmental knee arthroplasty? Short-term outcomes and phenotype distribution in a retrospective series of consecutive cases.Archives of orthopaedic and trauma surgery · 2026Article
- Restoration of pre-arthritic coronal alignment improves joint perception following fixed-bearing medial unicompartmental knee arthroplasty.Frontiers in surgery · 2026Article
- Predicting postoperative coronal alignment in medial unicompartmental knee arthroplasty using the arithmetic hip-knee-ankle angle.Arthroplasty (London, England) · 2025Article
- Conventional mobile-bearing unicompartmental knee arthroplasty effectively achieves personalised alignment: A single surgeon series of 2472 knees.Journal of orthopaedics · 2025Article
- Restricted kinematic total knee arthroplasty provided better functional outcomes and higher satisfaction rates for Asians of genu varum with apex distal joint line over unrestricted kinematic total knee arthroplasty.Arthroplasty (London, England) · 2025Article
- Magnetic resonance imaging provides additional utility in the preoperative cartilage assessment of patients undergoing medial unicompartmental knee arthroplasty.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025Article
- Influence of Femoral Component Flexion on Outcomes After Primary Total Knee Arthroplasty.Arthroplasty today · 2025Article
- Coronal plane alignment changes do not affect outcome for total knee implant design with 3 degree varus joint line.Journal of orthopaedic surgery and research · 2025Article
- Coronal plane changes in fixed- versus mobile-bearing unicompartmental knee replacements: Clinical and revision outcomes.Journal of experimental orthopaedics · 2025Article
- Restoring coronal pre-arthritic alignment in mobile-bearing unicompartmental knee arthroplasty: mid- to long-term outcomes.BMC musculoskeletal disorders · 2025Article
- Impact of Aging and Knee Osteoarthritis on Lower Limb Alignment and CPAK Classification: Gender Differences in a Japanese Cohort.Journal of clinical medicine · 2024Article
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Authors and funding
5 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe optimal alignment target for unicompartmental knee arthroplasty (UKA) remains controversial, and literature suggests that its impact on patient-reported outcome measures (PROMs) varies. The purpose of this study was to identify the relationship between changes in the coronal plane alignment of the knee (CPAK) and PROMs in patients who underwent UKA.
methodsA retrospective analysis of 164 patients who underwent UKA was conducted. The types of CPAK types categorized into unchanged, minor (shift to an adjacent CPAK type, e.g., type I to II or type I to IV), and major changes (transitioning to a nearby diagonal CPAK type or two types across, such as type I to V or type I to III). PROMs were assessed preoperatively and 1 year postoperatively using the Hospital for Special Surgery (HSS) scores, Knee Society (KS) scores, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and Forgotten Joint Scores (FJS). Comparison was performed between patients who experienced and who did not experience any changes in the CPAK.
resultsPatients with preserved native CPAK alignment demonstrated significantly superior 1 year postoperative outcomes, with higher HSS, KS knee, and WOMAC pain scores (p = 0.042, p = 0.009, and p = 0.048, respectively). Meanwhile, the degree of change in CPAK did not significantly influence the PROMs, and patients who experienced minor and major changes in the CPAK showed comparable outcomes.
conclusionPreserving the native CPAK in UKA procedures is important for achieving favorable clinical outcomes at 1 year postoperative. The extent of change in the CPAK type exerted a limited impact on PROMs, thus emphasizing the importance of change in alignment itself.
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