Systems for Augmented Reality Guidance for Aligning Physical Tools and Instruments for Arthroplasty Component Placement, including Robotics

A system of preparing a physical joint in a patient comprising:

• at least one computer processor configured to generate a virtual surgical guide, wherein the virtual surgical guide is a virtual tool or virtual instrument;
• and
• a see-through optical head mounted display configured to display the virtual tool or virtual instrument at a predetermined position, predetermined orientation or a combination thereof onto a surface of the physical joint visible directly through the see-through optical head mounted display, so as to superimpose the virtual tool or virtual instrument onto the surface of the physical joint,
• wherein the virtual tool or virtual instrument is configured to allow superimposition and alignment between the virtual tool or virtual instrument and a physical tool or physical instrument at the predetermined position, predetermined orientation or a combination thereof,
• wherein the physical tool or physical instrument is visible directly through the see-through optical head mounted display, and
• wherein the physical tool or physical instrument is configured for placement of a physical implant component at a desired angle, version, inclination, resection level, varus or valgus angle, flexion, slope, rotation or combination thereof or to modify the surface of the physical joint for placement of a physical implant component at a desired angle, version, inclination, resection level, varus or valgus angle, flexion, slope, rotation or combination thereof.