Same patient, same total knee arthroplasty, different outcomes ? A pilot study comparing conventional vs. OMNIBotics Robotic-Assisted HLS Kneetec TM (Corin ® )
Abstract
INTRODUCTION: is a third condyle posterior stabilized TKA, initially designed for implantation using conventional manual instrumentation (C-TKA), and intended for use with an adjusted mechanical alignment. It can now also be implanted with robotic assistance. This pilot study aimed to evaluate the association between RA-TKA versus C-TKA and clinical outcomes in patients with bilateral knee osteoarthritis. MATERIALS AND METHODS: This 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)). RESULTS: RA-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). CONCLUSION: In 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.
Related
- Comparing Vegetation Characteristics and Production Outcomes of Semi-Natural Permanent Grassland and Sown Ley: A Case Study in a Hemi-Boreal Region
- Irreversible electroporation for liver metastases not amenable to conventional treatments, an experience with technical challenges, clinical outcomes, and complications
- Pregnancy outcomes in women conceiving after hematopoietic stem cell transplantation versus conventional chemotherapy for childhood or adolescent acute leukemia
- Same visitors, different outcomes: floral phenotype gates pollinator-vectored nectar microbial establishment
- Comparing pest survey methods through detection probability: seasonal and abundance-dependent detection of spotted lanternfly (Lycorma delicatula, Hemiptera: Fulgoridae)
BibTeX
@article{roblot2026same,
title = {{Same patient, same total knee arthroplasty, different outcomes ? A pilot study comparing conventional vs. OMNIBotics Robotic-Assisted HLS Kneetec TM (Corin ® )}},
author = {Galdéric Roblot and Marie Moret and Quentin Seguret and Sofiane Taouli and Bassel Al Hassoun and Olivier Roux and Patrice Mertl and Cecile Laterza and Mike Raimi},
journal = {SICOT-J},
year = {2026},
month = sep,
doi = {10.1051/sicotj/2026057},
url = {https://hal.science/hal-05752746v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Same patient, same total knee arthroplasty, different outcomes ? A pilot study comparing conventional vs. OMNIBotics Robotic-Assisted HLS Kneetec TM (Corin ® )
AU - Galdéric Roblot
AU - Marie Moret
AU - Quentin Seguret
AU - Sofiane Taouli
AU - Bassel Al Hassoun
AU - Olivier Roux
AU - Patrice Mertl
AU - Cecile Laterza
AU - Mike Raimi
PY - 2026
DA - 2026/09/01
JO - SICOT-J
DO - 10.1051/sicotj/2026057
UR - https://hal.science/hal-05752746v1
AB - INTRODUCTION: is a third condyle posterior stabilized TKA, initially designed for implantation using conventional manual instrumentation (C-TKA), and intended for use with an adjusted mechanical alignment. It can now also be implanted with robotic assistance. This pilot study aimed to evaluate the association between RA-TKA versus C-TKA and clinical outcomes in patients with bilateral knee osteoarthritis. MATERIALS AND METHODS: This 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)). RESULTS: RA-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). CONCLUSION: In 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.
SN - 2426-8887
ER -