Mid-term results about first 106 patient cohort after robotic-assisted total knee arthroplasty (rTKA) with ROSA knee...

Robotic-assisted total knee arthroplasty (rTKA) was developed to improve surgical accuracy, ligament balancing, and implant alignment compared with conventional techniques. The aim of this study was to evaluate the clinical and radiological outcomes of rTKA using the ROSA^® system after 5-year follow-up. A retrospective single-center observational study was conducted including first 106 patients with symptomatic knee osteoarthritis who underwent rTKA. All procedures were performed by the same surgical team using the imageless ROSA^® (Zimmer-Biomet) robotic system. Demographic, surgical, radiological, and functional variables were analyzed using the Oxford Knee Score (OKS), Knee Society Score (KSS), WOMAC, and VAS scales. Implant alignment was assessed using long-leg radiographs, and the first 20 cases were compared with the subsequent 86 cases. The study included 106 patients with a mean age of 72.3 ± 8.6 years and a mean follow-up of 60.0 ± 5.5 months. Mean surgical time was 93 ± 12.5 min, and mean hospital stay was 5 ± 1.5 days. Mean KSS and OKS scores were 89.2 ± 8.2 and 40.6 ± 4.5 respectively. Mean VAS pain score was 2.6 ± 1.6. Radiologically, constitutional alignment was maintained or corrected toward neutral alignment (HKA 0° ± 2°) in 96.2% of patients. No statistically significant differences were observed between the initial and subsequent learning-curve groups with global implant survivorship of 98.2%. ROSA^® rTKA demonstrated satisfactory mid-term radiological outcomes, with accurate implant alignment and a low complication rate. Long-term comparative studies are needed to determine its superiority over conventional TKA techniques.