ArticleEuropean journal of orthopaedic surgery & traumatology : orthopedie traumatologie2025
Distribution of coronal plane alignment of the knee and functional knee phenotype classification in the Thai arthritic population and correlation with other Asian populations.
Article in European journal of orthopaedic surgery & traumatology : orthopedie traumatologie, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Speaking the same language? A direct cartography between functional knee phenotypes and CPAK.Journal of experimental orthopaedics · 2026Article
- The Coronal Plane Alignment of the Knee Classification in Patients With Medial Meniscal Posterior Root Tears.Orthopaedic journal of sports medicine · 2026Article
- Sex-specific differences in coronal knee alignment and CPAK distribution in an Austrian population.Archives of orthopaedic and trauma surgery · 2025Article
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Authors and funding
5 authors.
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Abstract
purposeThe Coronal Plane Alignment of the Knee (CPAK) and Functional Knee Phenotype (FKP) classification system categorize knee phenotypes into subtypes. It has been proposed that maintaining constitutional knee alignment in knee arthroplasty may enhance outcomes. Therefore, this study aimed to examine the phenotypic distribution in a Thai population using the CPAK and FKP classifications and its correlation with other Asian populations.
methodsThis retrospective cohort study included 509 patients who underwent knee arthroplasty. Long-leg standing weight-bearing radiographs were used to categorize patients according to the CPAK (arithmetic hip-knee-ankle angle [aHKA], joint-line obliquity [JLO]) and FKP (hip-knee-ankle angle [HKA], femoral mechanical angle [FMA], and tibial mechanical angle [TMA]) classification system.
resultsThe most common CPAK distribution was type I (49.3%), followed by type II (20.6%) and type IV (11.0%). In males, CPAK Types I and II were the most common, similar to females; however, males had a significantly higher rate of Type I than females (58.8% vs. 46.5%, p = 0.049). The most frequent FKP was VAR
conclusionThe Thai arthritic population demonstrates a significant trend toward apex distal JLO and varus alignment, aligning with findings from other Asian populations, which aids in the personalization of knee arthroplasty approaches.
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