ArticleJournal of experimental orthopaedics2026
Early recovery patterns differ between medially congruent and posterior-stabilized total knee arthroplasty, with comparable 2-year outcomes: A triple-blinded randomized clinical trial.
Article in Journal of experimental orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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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.
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6 authors.
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Abstract
Purpose: Whether medially congruent (MC) total knee arthroplasty (TKA) provides clinically meaningful advantages over posterior-stabilized (PS) designs remains controversial. In this randomized trial, early recovery profiles and 2-year outcomes were compared between Persona® MC and PS TKA. Methods: In this triple-blinded randomized controlled trial, 82 patients undergoing primary TKA for Kellgren-Lawrence Grade IV osteoarthritis were allocated to receive a Persona® MC or PS system. The primary endpoint was Knee injury and Osteoarthritis Outcome Score-Activities of Daily Living (KOOS-ADL). Secondary outcomes included range of motion, visual analogue scale (VAS) pain, Forgotten Joint Score-12 (FJS-12), satisfaction and complications. Follow-up was 2 years. Group, time and group × time interaction were assessed using repeated-measures models. Results: Both groups improved over time. Significant group × time interactions were observed for ROM, VAS pain, KOOS-ADL and FJS-12, indicating different recovery profiles. MC knees had greater flexion at 2 weeks (95.3° vs. 83.9°, Conclusion: Persona® MC and PS TKA showed different recovery profiles rather than clear superiority of either design. MC-TKA was associated with better early flexion and fewer observed early flexion contractures, whereas PS TKA was associated with lower early postoperative pain and greater flexion at later follow-up. MC showed statistically higher KOOS-ADL and FJS-12 scores, but these differences remained below minimum clinically important difference thresholds. Both designs provided substantial 2-year improvement without clinically meaningful between-group differences in patient-reported outcomes. Level of Evidence: Level I.
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