ArticleScientific reports2026
NATON robotic-assisted unicompartmental knee arthroplasty achieves superior radiological alignment and comparable one-year functional outcomes to conventional surgery.
Article in Scientific reports, 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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Abstract
To compare the early clinical efficacy and postoperative implant alignment between NATON robotic-assisted unicompartmental knee arthroplasty (RA-UKA) and conventional UKA (C-UKA) in treating severe medial compartment knee osteoarthritis (OA). This retrospective matched cohort study included 40 RA-UKA and 40 C-UKA patients, matched 1:1 by age, gender, and surgical site et al. Primary outcomes included operative time, intraoperative blood loss, and patient-reported outcome measures (PROMs): knee society score (KSS), Oxford knee score (OKS), visual analogue scale (VAS) for pain, and forgotten joint score (FJS). Radiological assessments included coronal/sagittal angular deviations of femoral/tibial components, hip-knee-ankle (HKA) angle, and Kennedy zone distribution. The follow-up time was 15.4 ± 1.6 months. Operative time was significantly longer in the RA-UKA group (95.8 ± 6.8 min vs. 75.3 ± 6.5 min, P < 0.001). No significant differences were observed in KSS score, OKS score, or intraoperative blood loss between groups (all P > 0.05). RA-UKA achieved significantly better subjective PROMs, with lower VAS score (1.97 vs. 2.5, P = 0.012, Cohen’s d = − 0.60) and higher FJS score (86.9 vs. 84.3, P = 0.025, Cohen’s d = 0.50). The RA-UKA group had smaller femoral component coronal alignment deviation (2.39 ± 1.41° vs. 5.79 ± 1.15°, P < 0.001, Cohen’s d = − 2.46) and flexion alignment deviation (3.3° (2.9–4.0) vs. 6.5° (5.9–7.1), P < 0.001, Cohen’s d = − 0.78). No significant differences were observed in tibial component coronal deviation and posterior tibial slope(PTS) deviation between two groups (all P > 0.05). Correlation analysis revealed weak negative correlations between FJS score and femoral coronal/flexion deviations (all P < 0.05). VAS score was weakly positive correlated with PTS deviation (ρ = 0.240, P = 0.032) and moderately positive correlated with femoral coronal deviation (r = 0.311, P = 0.005). No serious complications occurred in either group during follow-up. The NATON RA-UKA achieved more accurate early implant positioning than C-UKA, while short-term clinical outcomes were generally comparable between groups.
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