Trial reportOrthopadie (Heidelberg, Germany)2026
Coronal plane alignment of the knee (CPAK) phenotypes and their relationship with gap patterns in robotic-assisted total knee arthroplasty: a clinical trial.
Trial report in Orthopadie (Heidelberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
1 citing paper in PubMed.
- Bridging postural biomechanics and knee arthroplasty success.Arthroplasty (London, England) · 2026Review
Corrections and comments
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundAchieving optimal soft-tissue balance remains a key challenge in total knee arthroplasty (TKA), even with robotic assistance. The coronal plane alignment of the knee (CPAK) classification provides a structured description of constitutional alignment phenotypes, yet its relationship with intraoperative gap behavior has not been fully defined.
methodsA prospective series of 285 patients undergoing robotic-assisted TKA with the CORI system was analyzed. Knees were categorized according to the CPAK classification and intraoperative medial and lateral gaps were automatically recorded in extension (0°) and flexion (90°). Gap configurations were defined as balanced, varus, or valgus. Associations between CPAK phenotypes and gap types were assessed using χ
resultsThe CPAK I and CPAK II phenotypes showed a significantly higher likelihood of varus gaps in both extension (odds ratio, OR 5.41 and 3.38, respectively) and flexion (OR 1.58 and 2.20, respectively), whereas CPAK VII was protective in extension (OR 0.23). Even valgus-aligned phenotypes demonstrated varus-dominant behavior in flexion. These findings indicate that gap behavior is strongly influenced by CPAK phenotype rather than solely by surgical alignment.
conclusionIntraoperative soft-tissue balance during TKA reflects the underlying CPAK phenotype. Integrating CPAK classification into robotic planning enables anticipation of gap tendencies and facilitates phenotype-driven balancing, bridging constitutional anatomy with functional alignment.
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