Robotic system for shoulder arthroplasty using stemless implant components

A method of operating a robotic surgery system for preparing a bone of a shoulder joint to receive a shoulder implant, the robotic surgery system including a robotic manipulator, a cutting tool coupled to the robotic manipulator, a localizer configured to track movement of the cutting tool and the bone, and one or more controllers, the method comprising:

• obtaining, with the one or more controllers, one or more virtual objects that define a volume of material to be removed from the bone for receipt of the shoulder implant, the shoulder implant including a distal body extending along an implant axis and a planar locking member that extends radially outward from the distal body along a plane perpendicular to the implant axis, and wherein the planar locking member is rigidly coupled to the distal body in a fixed position;
• and
• operating, with the one or more controllers, the robotic manipulator to control movement of the cutting tool relative to the bone based on the one or more virtual objects to form a first cavity and a second cavity in the bone, the first cavity being sized and shaped to receive the distal body and the planar locking member of the shoulder implant in an unlocked position, and the second cavity being formed beneath the first cavity to define an undercut in the bone, the second cavity being planar and sized and shaped to receive the distal body and the planar locking member of the shoulder implant in the unlocked position and to enable the planar locking member to rotate within the second cavity from the unlocked position to a locked position whereby the undercut engages the planar locking member to limit withdrawal of the shoulder implant from the bone.