Observational studyJournal of robotic surgery2025
Impact of femoral component flexion on gap balancing in varus knees using robotic technology: a comparative study of single-radius and multi-radius designs.
Observational study in Journal of robotic surgery, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
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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.
- Robotic-Assisted Total Knee Arthroplasty in Complex Primary and Revision Cases: A Systematic Review.Current reviews in musculoskeletal medicine · 2026Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Accurate flexion-extension gap balancing is critical in total knee arthroplasty (TKA), influencing postoperative stability and longevity. Femoral component flexion in the sagittal plane has been suggested as a means to adjust gap balance; however, its impact across different implant designs remains unclear. This study compares the influence of femoral component flexion on gap balancing between single-radius and multi-radius femoral components using robotic-assisted TKA. A prospective observational cohort study was conducted on 200 patients (100 in each cohort) undergoing primary robotic-assisted TKA for varus deformity with end-stage osteoarthritis. Patients were randomized to receive either single-radius (Stryker MAKO with Stryker Triathlon implants) or multi-radius (Meril CUVIS with Maxx-Freedom implants) femoral components. Intraoperative medial and lateral flexion-extension gaps were assessed at femoral flexion increments from 0° to 6° using robotic measurement software, and statistical analyses were done. Femoral component flexion had distinct impacts on gap balancing depending on implant design. Multi-radius implants showed significant variability with extension medial gaps progressively loosened (mean Change 0.19 mm/degree of flexion, p < 0.001), and flexion medial and lateral gaps progressively tightened (mean Changes 0.21 mm/degree, p < 0.001 and 0.24 mm/degree, p < 0.05, respectively). Conversely, single-radius implants demonstrated minimal variability in all gap measurements across degrees of femoral flexion (p > 0.05). Femoral component flexion significantly affects gap balancing during robotic-assisted TKA, particularly in multi-radius femoral components. Multi-radius designs require careful sagittal alignment to prevent undesirable gap variations, whereas single-radius implants exhibit more predictable gap balancing profiles, potentially simplifying intraoperative adjustments. Future research should evaluate long-term clinical outcomes related to these findings.
Indexed as
Identifiers
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Registered trials
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