Patella implant planning
AssigneeMAKO Surgical Corp.
InventorsMichael C. Ferko, Emily Hampp
Life of this patent
Estimating the term…
Abstract
Disclosed herein are systems and methods of patella preparation. A method of patella preparation includes creating a patellar coordinate system utilizing key honey landmarks of a patella on a virtual model of an unresected patella. The method can further include defining a resection plane at a predetermined implant thickness and aligning the resection plane with the patellar coordinate system. Implant selection can be finalized on the resection plane to meet predetermined tolerances. A navigated patella clamp with a tracker and stylus can then be used to intraoperatively resect the patella and locate the implant.
Claims20
A method of generating an anatomical coordinate system for a virtual bone model of an irregularly shaped bone, comprising:
- displaying the virtual bone model of the bone on a graphical user interface;
- selecting a first set of points using the graphical user interface on a vertical ridge of the virtual bone model defining a vertical ridge line;
- creating a reference plane transverse to the vertical ridge line;
- selecting a second set of points using the graphical user interface about a circumference of the virtual bone model;
- defining a medial-lateral tilt line from a projected center point of the second set of points on the reference plane;
- and
- generating the anatomical coordinate system from first, second and third planes defined by the medial-lateral tilt line and vertical ridge line.
A method of determining a position of a resection cut on a bone, comprising:
- displaying a virtual bone model of the bone on a graphical user interface;
- creating a reference plane transverse to a vertical ridge line by selecting a first set of points using the graphical user interface on a vertical ridge of the virtual bone model to define the vertical ridge line;
- selecting a second set of points using the graphical user interface about a circumference of the virtual bone model;
- defining a medial-lateral tilt line from a projected center point of the second set of points on the reference plane;
- creating a medial-lateral tilt plane from the medial lateral line;
- generating an anatomical coordinate system coincident to the medial-lateral tilt of the bone;
- calculating a thickness of the bone;
- and
- defining a resection plane at a predetermined bone thickness and parallel to the medial-lateral tilt plane of the anatomical coordinate system.
A method of generating an anatomical coordinate system for a virtual bone model of an irregularly shaped bone, comprising:
- displaying the virtual bone model of the bone on a graphical user interface;
- selecting a first set of points using the graphical user interface on a vertical ridge of the virtual bone model defining a vertical ridge line;
- creating a reference plane transverse to the vertical ridge line;
- selecting a second set of points using the graphical user interface about a circumference of the virtual bone model;
- defining a medial-lateral tilt line from a projected center point of the second set of points on the reference plane;
- and
- creating a first plane through the medial-lateral tilt line and parallel to the vertical ridge line, a second plane through the vertical ridge line and transverse to the first plane, and a third plane transverse to the first and second planes,
- wherein the first, second and third planes define the anatomical coordinate system.
Dependencies are inferred from the claim text.