Device and method for hip-knee-ankle angle verification and femoral mechanical axis digitization

摘要

The disclosed device for verifying a hip-knee-ankle angle includes a mounting base having a planar abutting surface adapted for direct abutting against a resected surface on a distal femur, and a first inertial sensor in communication with a computer assisted surgery (CAS) system to determine an orientation of the mounting base and to digitize a mechanical axis of the femur. A visual alignment guide element is pivotably mounted to the mounting base such that the angular position of the visual alignment guide element is adjustable so as to be visually aligned with a mechanical axis of a tibia. A difference between orientations of the mounting base and the visual alignment guide is calculated by the computer assisted surgery system to determine the hip-knee-ankle angle. The visual alignment guide may include a second inertial sensor and/or a laser emitting element.

主权项

1. A device for verifying a hip-knee-ankle angle using an inertial-based computer assisted surgery system during a knee replacement surgery, the device comprising:
a mounting base having at least one planar abutting surface integrated into the mounting base and adapted for direct abutting against a resected surface on a distal femur, the mounting base including at least a first inertial sensor in wireless communication with the computer assisted surgery system and operable to determine at least an orientation of the mounting base and to provide orientation data for at least two angular degrees of freedom to the computer assisted surgery system representative of said orientation of the mounting base, the mounting base being thereby operable to digitize at least a mechanical axis of a femur; a visual alignment guide element pivotally mounted to the mounting base such that the visual alignment guide element is pivotable about at least one axis of rotation to adjust an angular position, and therefore an orientation, thereof, the visual alignment guide element being displaceable to be visually aligned with a mechanical axis of a tibia; and wherein a difference between the orientation of the mounting base and the orientation of the visual alignment guide as calculated by the computer assisted surgery system corresponds to the hip-knee-ankle angle.