A system for ultrasound-guided computer-assisted orthopaedic surgery

Area of Science:

• Orthopedic Surgery
• Medical Imaging
• Biomedical Engineering

Background:

• Current computer-assisted orthopedic surgery (CAOS) relies on CT and fluoroscopy, exposing patients and surgeons to ionizing radiation.
• Existing CAOS methods require invasive tracking devices, causing pain, prolonging recovery, and limiting use with small or mobile fractures.

Purpose of the Study:

• To develop a novel CAOS method utilizing 2D ultrasound (US) as a safer, non-invasive imaging modality.
• To overcome the limitations of current CAOS systems, including radiation exposure and the need for invasive tracking.

Main Methods:

• Employed 2D ultrasound (US) as the primary imaging modality for computer-assisted orthopedic surgery.
• Developed a registration technique that does not require invasive mounting or image segmentation.
• Utilized a minimal number of US images for accurate patient localization.

Main Results:

• The proposed registration technique achieved sub-millimetric accuracy in matching intraoperative and preoperative images.
• Demonstrated the feasibility of the US-based CAOS method on a radius-bone phantom and human subjects.
• The method proved robust and accurate without requiring segmentation or invasive procedures.

Conclusions:

• The novel 2D US-guided CAOS method offers a radiation-free and non-invasive alternative to current techniques.
• This approach shows significant potential for improving orthopedic surgery, especially for challenging cases involving small bones or mobile fractures.
• The technique's accuracy, robustness, and ease of use present a promising advancement in orthopedic surgical navigation.