2025 ISAKOS Biennial Congress ePoster
Experience In Correcting Varus And Valgus Deformities In Total Knee Replacement With Robotic Surgery
Hector Zamorano, MD, Santiago CHILE
Roberto Yañez, MD,phD,prof, Santiago CHILE
Sebastian Valdes, student, Santiago CHILE
Gaston Caracciolo CHILE
Cristobal Yañez, MD, Santiago, RM CHILE
Sebastian Yanez, MD, Santiago CHILE
Leonardo Javier Carabajal Vera, MD, Cordoba, Cordoba ARGENTINA
Lars Raymond Strömback, MD, Santiago, RM CHILE
Magaly Iñiguez, MD, Santiago CHILE
Clinica MEDS, Santiago, Metropolitana, CHILE
FDA Status Cleared
Summary
155 patients indicated for TKA were prospectively included using the ROSA® robot (Zimmer Biomet). The average pre-surgical knee deformity was 6.9±5.11º. Post-intervention, valgus deformity (n=88) had a mean of 2.3±1.9º, while varus deformity (n=40) had a mean of 3.0±2.3º, and neutral cases were 27. ROSA®-assisted TKA is effective in correcting malalignment caused by knee osteoarthritis.
ePosters will be available shortly before Congress
Abstract
Introduction
Correcting knee malalignment is crucial for determining the effectiveness of robotic total knee arthroplasty (TKA).
Objective
To determine the degree of correction of knee malalignment as observed in radiographic images following robotic TKA.
Methods
155 patients indicated for TKA were prospectively included (2021-2024), adhering to Helsinki and ethical principles. A complete pre- and postoperative radiographic study of the lower extremity was conducted using the ROSA® robot (Zimmer Biomet). The magnitude of change was compared using a one-tailed paired t-test (α=5%). Normality was assessed using the Shapiro-Wilk test. The effect size was described using Cohen's d.
Results
The average pre-surgical knee deformity was 6.9±5.11º with a range of 0-24º and a mode of 2º, decreasing (p<0.001, d’Cohen = 0.9) to 2.3±2.21º with a range of 0º-15º and a mode of 0º. Valgus deformity (n=61) had a mean of 8.4±6.0º with a range of 0.2º-24.0º, while varus deformity (n=89) had a mean of 6.3±4.2º with a range of 0.7º-16.6º, and neutral cases were 5. Post-intervention, valgus deformity (n=88) had a mean of 2.3±1.9º with a range of 0.1º-10.0º, while varus deformity (n=40) had a mean of 3.0±2.3º with a range of 0.1º-15.0º, and neutral cases were 27.
Discussion And Conclusion
ROSA®-assisted TKA is effective in correcting malalignment caused by knee osteoarthritis. There is a significant reduction in preoperative deformity compared to postoperatively. The correction is significant for both valgus and varus deformities, with a substantial increase in neutral cases (27.4 times more postoperative neutral cases). These findings suggest that robotic surgery with the ROSA® robot improves alignment accuracy and outcomes in TKA, supporting its use as a viable option.