ArticleSICOT-J2026
Same patient, same total knee arthroplasty, different outcomes? A pilot study comparing conventional vs. OMNIBotics Robotic-Assisted HLS Kneetec
Article in SICOT-J, 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
introductionTotal knee arthroplasty (TKA) is a well-established treatment for end-stage knee osteoarthritis. Robotic-assisted TKA (RA-TKA) has emerged over the past decade, enabling patient-specific implantation, precise bone cuts, and intraoperative control of gap balance and alignment. The HLS Kneetec MATERIALS AND
methodsThis was a retrospective cohort of patients operated on by primary RA-TKA in a second osteoarthritic knee after contralateral C-TKA. Twenty-two patients constituted their own control group (44 knees). Mean age was 71.9 ± 7.4 years. The mean time between the two procedures was 22 ± 19 months. Primary outcomes measured were limb alignment (hip-knee-ankle (HKA)), range of motion (ROM), and Forgotten Joint Score (FJS) at one year postoperatively. Secondary outcomes included operating time, hospital stay, incision length, blood loss, and radiographic evaluation (femoral mechanical angle (FMA), tibial mechanical angle (TMA), tibial component slope angle (TSA), patellar tilt angle (PTA), and femoral axial rotation angle (FARA)).
resultsRA-TKA was associated with an HKA angle significantly closer to the target (177.9° vs. 175.3°, p = 0.012), with higher flexion (+7°, p = 0.032) and a higher FJS (+13.9 points, p < 0.001). Operating time was longer in the RA-TKA group (+19.5 min, p = 0.004), while hospital stay, blood loss, and incision length did not differ significantly between groups. Radiographically, RA-TKA was associated with reduced femoral valgus (FMA -1.3°, p = 0.001), with no significant differences in TMA or TSA. Patellar tilt was similar, whereas femoral external rotation was increased with RA-TKA (+1.1°, p = 0.0006).
conclusionIn this pilot study, RA-TKA was associated with superior frontal alignment and better patient-reported functional outcomes compared to C-TKA. However, given the inherent temporal confounding of the bilateral sequential design and the small sample size, these findings should be interpreted with caution. Further prospective, adequately powered studies are warranted to confirm these results.
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