Comparative Analysis of Autonomous Robotic and Manual Techniques for Ultrasonic Sacral Osteotomy: A Preliminary Study

2026-02-03

AI Summary

This study addresses the significant trajectory deviations and imprecise depth control inherent in manual ultrasonic sacral osteotomy by proposing, for the first time, an autonomous robotic system for ultrasonic sacral osteotomy. The system integrates a seven-degree-of-freedom robotic arm, an ultrasonic bone scalpel, and optical tracking technology to achieve high-precision osteotomy on Sawbones models. Quantitative evaluation comparing robotic and manual performance demonstrates that the robotic system achieves a root mean square error (RMSE) of only 0.11 mm in trajectory accuracy and a cutting depth of 8.1 mm—closely matching the target depth of 8.0 mm. In contrast, manual operation exhibits a substantially higher trajectory error of 1.10 mm and excessive cutting depth of 16.0 mm. These results indicate that the proposed robotic system effectively overcomes the intrinsic limitations of conventional manual techniques.

Technology Category

• Intelligent Robots: Manipulation
• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Search and Optimization: Mixed Discrete/Continuous Search

Application Category

• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Systems and Infrastructure for Web, Mobile and WoT: Experiences and lessons learnt from Web-based algorithms and system deployments
• User Modeling, Personalization and Recommendation: Studies of user behavior, including longitudinal effects of personalized systems

Abstract

In this paper, we introduce an autonomous Ultrasonic Sacral Osteotomy (USO) robotic system that integrates an ultrasonic osteotome with a seven-degree-of-freedom (DoF) robotic manipulator guided by an optical tracking system. To assess multi-directional control along both the surface trajectory and cutting depth of this system, we conducted quantitative comparisons between manual USO (MUSO) and robotic USO (RUSO) in Sawbones phantoms under identical osteotomy conditions. The RUSO system achieved sub-millimeter trajectory accuracy (0.11 mm RMSE), an order of magnitude improvement over MUSO (1.10 mm RMSE). Moreover, MUSO trials showed substantial over-penetration (16.0 mm achieved vs. 8.0 mm target), whereas the RUSO system maintained precise depth control (8.1 mm). These results demonstrate that robotic procedures can effectively overcome the critical limitations of manual osteotomy, establishing a foundation for safer and more precise sacral resections.

Problem

• Ultrasonic Sacral Osteotomy
• manual osteotomy
• trajectory accuracy
• cutting depth control
• sacral resection

Innovation

• autonomous robotic surgery
• ultrasonic osteotomy
• optical tracking
• sacral resection
• trajectory accuracy