Robotic system for shoulder arthroplasty using stemless implant components

A method for performing robotic surgery with a robotic manipulator and a cutting tool coupled to the robotic manipulator to prepare a bone of a shoulder joint to receive a shoulder implant, the method comprising the steps of:

• providing the shoulder implant, the shoulder implant having a proximal body, a distal body, and a locking member;
• tracking movement of the cutting tool;
• tracking movement of the bone;
• controlling movement of the cutting tool relative to the bone based on one or more virtual objects associated with the shoulder implant to form a first cavity in the bone sized to receive the distal body of the shoulder implant and to form a second cavity in the bone sized to receive the locking member, the second cavity radially off-set from the first cavity relative to an implant axis and defining an undercut in the bone whereby the locking member is moved from an unlocked position in the first cavity to a locked position in the second cavity to limit withdrawal of the shoulder implant from the bone;
• and
• inserting the shoulder implant at least partially into the first cavity and rotating the implant about the implant axis to rotate the locking member into engagement with the undercut of the second cavity formed by the cutting tool and place the implant into the locked position.

A robotic surgery system for preparing a bone of a shoulder joint to receive a shoulder implant system, the robotic surgery system comprising:

• said shoulder implant system having a proximal body, a distal body, and a locking member;
• a robotic manipulator;
• a cutting tool to be coupled to said robotic manipulator;
• a localizer configured to track movement of said cutting tool and the bone;
• and
• a controller coupled to said robotic manipulator and said localizer, said controller configured to operate said robotic manipulator to control movement of said cutting tool relative to the bone based on one or more one or more virtual objects associated with said shoulder implant system,
• wherein said one or more virtual objects defines a volume of material to be removed from the bone to form a first cavity sized to receive said distal body of said shoulder implant system and to form a second cavity defining an undercut in the bone and radially off-set from the first cavity relative to an implant axis and sized to rotationally receive said locking member whereby when said shoulder implant is at least partially inserted into the first cavity and rotating said locking member about the implant axis from an unlocked position in the first cavity to a locked position in the second cavity to engage said locking member to the undercut of the second cavity formed by said cutting tool to limit withdrawal of said shoulder implant system from the bone.

A method for performing robotic surgery with a robotic manipulator and a cutting tool coupled to the robotic manipulator to prepare a bone of a shoulder joint to receive a shoulder implant system, the method comprising the steps of:

• providing the shoulder implant system having a proximal body, a distal body, and a locking member;
• tracking movement of the cutting tool;
• tracking movement of the bone;
• and
• controlling movement of the cutting tool relative to the bone based on one or more virtual objects associated with the shoulder implant system to form a first cavity in the bone sized to receive the distal body of the shoulder implant system and to form a second cavity in the bone that is radially off-set from the first cavity relative to an implant axis and sized to receive the locking member, whereby the locking member limits withdrawal of the shoulder implant system from the bone;
• and
• inserting the shoulder implant system at least partially into the first cavity and rotating the implant about the implant axis to rotate the locking member into the second cavity formed by the cutting tool and the implant into a locked position.