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August 19, 2026Knee Surgery Sports Traumatology ArthroscopyOpen Access

A new cementless tibial baseplate in kinematically aligned total knee arthroplasty has low migration and stabilizes at 3 months: A cohort study using radiostereometric analysis

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Authors

RMRubiana MonteiroAMAli MohammadiANAlexander J. Nedopil

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Overview

Cohort study demonstrates low migration and early stabilization of a cementless tibial baseplate in knee arthroplasty, indicating a minimal risk of long-term loosening.

Key Points

  • Determine whether migration of a new cementless tibial baseplate in kinematically aligned total knee arthroplasty remains below the 6-month threshold for long-term loosening and assess when stability occurs.
  • Assessed 45 patients undergoing kinematically aligned total knee arthroplasty with a new cementless tibial baseplate, 38% of whom had a tibial recut.
  • Tracked baseplate migration using model-based radiostereometric analysis postoperatively and at 6 weeks, 3 months, and 6 months.
  • Mean maximum total point motion (MTPM) at 6 months was 0.93 mm, significantly below the 1.15 mm stability threshold (p = 0.015), with stability achieved by 3 months.
  • Baseplate migration showed no correlation with the medial proximal tibial angle (ρ = 0.050, p = 0.77) or hip-knee-ankle angle (ρ = 0.060, p = 0.72).
  • Mean MTPM did not differ between the recut group (0.85 ± 0.56 mm) and the non-recut group (0.97 ± 0.64 mm, p = 0.57).

Cite This Study

Monteiro et al. (2026) studied this question.

synapsesocial.com/papers/6a8563c403308d306e2d710bhttps://doi.org/10.1002/ksa.70572
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1An Insert Goniometer Can Help Select the Optimal Insert Thickness When Performing Kinematically Aligned Total Knee Arthroplasty with a Medial 1:1 Ball-in-Socket and Lateral Flat Surface Insert and Posterior Cruciate Ligament Retention2024 · 3 citations
  2. 2A randomized controlled trial comparing two-year postoperative femoral and tibial migration of a new and an established cementless rotating platform total knee arthroplasty2023 · 21 citations
  3. 3A new tibial insert design with ball-in-socket medial conformity and posterior cruciate ligament retention has low tibial baseplate migration after unrestricted kinematically aligned total knee arthroplasty: a cohort study using radiostereometric analysis2024 · 9 citations
  4. 4Early migration of tibial components is associated with late revision2012 · 210 citations
  5. 5Measurement Error Versus Repeated Measurements: A Guide Describing Two Methods for Computing Bias and Precision of Migration Measurements From Double Examinations Using Radiostereometric Analysis2022 · 12 citations