Naton Knee Joint Navigation System

Developed by Beijing Naton Medical Robotics Technology Co., Ltd., the Knee Joint Replacement Surgery Navigation and Positioning System received NMPA Class III certification in September 2023. The system addresses unicompartmental knee arthroplasty procedures, filling a gap in domestic robotic solutions for single-condyle knee replacement.

Product Overview

The Naton Knee Joint Navigation System assists surgeons in unicompartmental knee arthroplasty by providing precise positioning and navigation capabilities. The system combines optical tracking with AI-powered segmentation algorithms to guide prosthesis implantation. Unlike total knee replacement robots that address the entire joint surface, this system specifically targets medial or lateral compartment disease where only one portion of the knee requires replacement.

The platform operates through human-machine collaboration, where surgeons maintain control while the navigation system provides real-time feedback and positioning assistance. Sub-millimeter tracking accuracy enables consistent prosthesis placement across procedures.

Key Features

At sub-millimeter tracking accuracy, the Naton Knee Joint Navigation System guides unicompartmental knee arthroplasty with optical positioning and AI segmentation.

• AI Segmentation Algorithm: Proprietary image processing technology creates 3D reconstructions from preoperative imaging, enabling accurate surgical planning
• Sub-millimeter Tracking: Optical tracking system achieves positioning accuracy below 1mm for consistent implant placement
• Human-Machine Collaboration: Surgeons retain procedural control while receiving navigation guidance
• Real-time Feedback: Continuous display of instrument position relative to planned trajectories
• Compatible Prosthesis System: Works with the Zhengtian Unique fixed-bearing UKA prosthesis manufactured by Naton’s subsidiary

Technical Specifications

At NMPA Class III certification level, this navigation platform supports Zhengtian Unique UKA prosthesis placement with preoperative CT-based AI planning.

Clinical Applications

The system is indicated for medial unicompartmental knee arthroplasty in patients with single-compartment osteoarthritis. Clinical studies published in peer-reviewed journals report outcomes from procedures performed at institutions including Suining Central Hospital of Sichuan Province.

A retrospective analysis of 32 patients (32 knees) undergoing Naton robot-assisted medial UKA between November 2023 and January 2024 demonstrated:

• Mean follow-up period of 9.16 months
• No complications including infection, periprosthetic fracture, or prosthesis loosening
• All prostheses maintained proper positioning with no abnormal angle deviation
• Satisfactory knee function scores (KSS, OKS, FJS)

The surgical workflow includes intraoperative calibration of both femoral and tibial components, followed by robot-assisted osteotomy and prosthesis installation with space measurement verification.

Regulatory Status

The Naton Orthopedic Surgical Robot Clinical Training Center was established at the People’s Liberation Army General Hospital to support clinical adoption and surgeon training.

Frequently Asked Questions

What procedures can the Naton Knee Joint Navigation System perform?

The system is specifically designed for unicompartmental knee arthroplasty (UKA), also known as partial knee replacement. It assists in medial or lateral single-condyle replacement procedures for patients with isolated compartment arthritis.

How does this system differ from total knee replacement robots?

Unlike robotic systems for total knee arthroplasty that address all three knee compartments, this navigation system focuses specifically on partial knee replacement. UKA preserves healthy bone and ligaments, potentially offering faster recovery and more natural knee motion for appropriate candidates.

What clinical training is available for surgeons?

Naton established the Orthopedic Surgical Robot Clinical Training Center at the People’s Liberation Army General Hospital. The center provides hands-on training for surgeons adopting the navigation system.