ArticleJournal of orthopaedic surgery and research2024
Fixed-bearing medial unicompartmental knee arthroplasty restores pre-arthritic coronal alignment and achieves satisfactory functional outcomes: a retrospective study.
Article in Journal of orthopaedic surgery and research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Biomechanical consequences of minor medial joint line elevation after medial unicompartmental knee arthroplasty.Journal of orthopaedic surgery and research · 2026Article
- Radiolucent lines after robotic-assisted surface-matching kinematically aligned UKA: short-term incidence and lack of association with tibial alignment.Archives of orthopaedic and trauma surgery · 2026Article
- The effect of mechanical axis correction on clinical outcomes after unicondylar knee arthroplasty.BMC musculoskeletal disorders · 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
- Does preoperative varus alignment impact functional outcomes in robotic assisted medial unicompartmental knee arthroplasty? mid-term analysis.Journal of robotic surgery · 2025Article
- Conventional mobile-bearing unicompartmental knee arthroplasty effectively achieves personalised alignment: A single surgeon series of 2472 knees.Journal of orthopaedics · 2025Article
- Restoring prearthritic alignment improves joint perception in medial unicompartmental knee arthroplasty.Journal of experimental orthopaedics · 2025Article
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Authors and funding
6 authors.
Funding
Abstract
purposeThis study aimed to (1) analyze the Coronal Plane Alignment of the Knee (CPAK) classification in patients undergoing unicompartmental knee arthroplasty (UKA), (2) assess whether UKA can restore pre-arthritic coronal alignment by utilizing the arithmetic hip-knee-ankle angle (aHKA), and (3) evaluate the relationship between patient-reported outcome measures (PROMs) and postoperative alignment following UKA.
methodsWe retrospectively analyzed 152 consecutive patients who underwent fixed-bearing medial UKA. A radiological analysis was conducted using an EOS imaging system. Postoperative alignment was classified as neutral (varus ≤ 3°), mild varus (3° < varus ≤ 7°), or marked varus (varus > 7°) based on the mechanical hip-knee-ankle angle (mHKA). The aHKA was calculated and the CPAK classification was used to categorize knee phenotypes. The PROMs were obtained both before and after the surgery.
resultsA total of 152 knees from 113 patients were included with a mean two-year follow-up. The mean difference between the postoperative mHKA and the estimated aHKA was 0.80° (90% CI 0.35 to 1.24; P = 0.003). Postoperatively, 63 (41.45%) of the 152 knees were in neutral group, 54 (35.53%) mild varus, and 35 (23.03%) marked varus. The neutrally aligned cohort did not exhibit significantly higher scores in range of motion, VAS, HSS, WOMAC, or FJS-12 scores compared to the mild or marked varus cohort (P = 0.205, 0.118, 0.076, 0.140, and 0.788, respectively) during the short-term follow-up.
conclusionNon-robotically assisted, fixed-bearing medial UKA can restore pre-arthritic coronal alignment and achieve satisfactory PROMs. Fixed-bearing medial UKA aims to restore the pre-arthritic alignment rather than achieving neutral mechanical alignment.
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