Automatic placement and estimation of a reference grid for an anatomical coordinate system

JP2025521425A5Pending Publication Date: 2026-06-16SMITH & NEPHEW INC +2
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SMITH & NEPHEW INC
Filing Date
2023-06-22
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Current methods for determining the anatomical reference frame (ARF) and placing reference grids like the Bernard-Hertel (BH) grid and tibial grid in ACL reconstruction surgeries are plagued by observer variability and require manual processes that are time-consuming and unreliable, leading to inaccuracies in tunnel placement and orientation.

Method used

A computerized methodology that automatically places the BH grid and determines the ARF using a 3D model of the distal femur by aligning medial and lateral condyles, generating a radiograph, and determining the sagittal, axial, and coronal directions without relying on template models, and a similar method for the tibial grid using a 3D model of the proximal tibia to define the tibial plateau and tuberosity.

Benefits of technology

The method achieves accurate and reliable placement of the BH and tibial grids with negligible errors, improving surgical precision and reducing variability, with average errors significantly lower than existing methods, enabling more efficient and diverse application across different femur and tibia shapes.

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Abstract

A system and method for a computerized framework are disclosed that provide a novel mechanism for determining the automatic placement of a bone reference grid and an anatomical reference frame (ARF). The disclosed framework is operable for activation of a computerized mechanism that can determine, provide, and / or display the anatomically correct positions of femoral tunnels and / or other forms of surgical landmarks that a surgeon relies on for anterior cruciate ligament (ACL) procedures, based on a three-dimensional (3D) model of the distal femur. The disclosed framework is also operable for activation of a computerized mechanism that can determine, provide, and / or display the anatomically correct positions of tibial tunnels and / or other forms of surgical landmarks that a surgeon relies on for ACL procedures, based on a three-dimensional (3D) model of the proximal tibia.
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