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September 10, 2026Acta OrthopaedicaOpen Access

Association of preoperative flexion contracture and limited knee flexion with short-term patient-reported outcomes after medial unicompartmental knee arthroplasty

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Authors

TKTomofumi KinoshitaKBKristine Ifigenia BunyozKMKristian R. L. Mortensen

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Overview

Retrospective cohort study finds preoperative flexion contracture delays recovery after medial unicompartmental knee arthroplasty, indicating equivalent long-term functional improvements.

Key Points

  • To determine whether preoperative flexion contracture and limited knee flexion affect postoperative patient-reported outcomes following mobile-bearing medial unicompartmental knee arthroplasty in anteromedial osteoarthritis.
  • Retrospective analysis of N=1,199 patients undergoing mobile-bearing medial unicompartmental knee arthroplasty.
  • Patients were categorized by preoperative extension deficit (no contracture, <10°, ≥10°) and flexion angle (<120°, ≥120°).
  • Oxford Knee Score and Forgotten Joint Score-12 were evaluated at baseline, 3, 12, and 24 months postoperatively using multivariable general linear models.
  • At 12 months, patients with <10° flexion contracture exhibited greater score gains than those with ≥10° contracture for Oxford Knee Score (adjusted mean difference: 5.5 points, 95% CI 0.9–10.2, P=0.01) and Forgotten Joint Score-12 (adjusted mean difference: 17.0 points, 95% CI 1.0–33.0, P=0.03).
  • Patients with <120° preoperative flexion showed greater 12-month Forgotten Joint Score-12 gains than those with ≥120° (adjusted mean difference: 4.8 points, 95% CI 0.1–9.6, P=0.045).
  • By 24 months post-surgery, 95% confidence intervals for all between-group differences included zero, indicating no difference in functional improvements regardless of preoperative stiffness.

Cite This Study

Kinoshita et al. (2026) studied this question.

synapsesocial.com/papers/6aa27be758559d80afc756f7https://doi.org/10.2340/17453674.2026.46721
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