Reverse shoulder pre-operative planning

A method of pre-operatively developing a shoulder arthroplasty plan, the method comprising:

• receiving an image of a patient shoulder comprising a humerus and a glenoid;
• segmenting the image to develop a 3D shoulder model;
• selecting, based at least in part on the 3D shoulder model, a humeral implant;
• selecting, based at least in part on the 3D shoulder model, a glenoid implant;
• positioning within the 3D shoulder model a virtual representation of the humeral implant on the virtual humerus and a virtual representation of the glenoid implant on the virtual glenoid;
• analyzing the 3D shoulder model with the virtual representation of the humeral implant and the virtual representation of the glenoid to determine a condition of the patient shoulder including determining an expected interaction between the humerus implant and the glenoid implant;
• generating a shoulder arthroplasty plan based at least in part on the condition;
• wherein the condition is a range of motion of the patient shoulder;
• displaying on a user interface a graphic representation of the range of motion;
• displaying, on the graphic representation of the range of motion, a range of motion required to perform a common daily activity;
• determining whether the 3D shoulder model can perform the common daily activity as a function of the range of motion;
• selecting, when the 3D shoulder model cannot perform the common daily activity, a second humeral implant, and
• positioning a virtual representation of the second humeral implant within the 3D shoulder model.

A method of pre-operatively developing a reverse shoulder arthroplasty plan, the method comprising:

• performing virtual surgery on a 3D shoulder model using a system to generate a modified shoulder model, the virtual surgery comprising:
• resecting and reaming a virtual humerus of the 3D shoulder model;
• reaming a virtual glenoid of the 3D shoulder model;
• implanting, virtually to update the modified shoulder model on the system, a virtual representation of a humeral implant on the virtual humerus and a virtual representation of a glenoid implant on the virtual glenoid;
• determining, using the system, a range of motion of the patient shoulder based on analysis of the updated modified shoulder model including determining an expected interaction between the virtual representation of the humerus implant and the virtual representation of the glenoid implant after the selected virtual humeral implant and the selected virtual glenoid implant are virtually implanted;
• selecting, using the system and in response to determining that the range of motion is not within the desired range, at least one of a second humeral implant and a second glenoid implant;
• and
• determining, when the range of motion is not within the desired range, a second range of motion of the patient shoulder based on analysis of the updated modified shoulder model including determining an expected interaction between the virtual representation of the second humerus implant and the second humeral implant and the second glenoid implant.

A non-transitory machine-readable medium including instructions, for pre-operatively developing a reverse shoulder arthroplasty plan, which when executed by a machine, cause the machine to:

• perform virtual surgery on a 3D shoulder model using a system to generate a modified shoulder model, the virtual surgery comprising:
• resecting and reaming a virtual humerus of the 3D shoulder model;
• reaming a virtual glenoid of the 3D shoulder model;
• implant, virtually to update the modified shoulder model on the system, a virtual representation of a humeral implant on the virtual humerus and a virtual representation of a glenoid implant on the virtual glenoid;
• determine, using the system, a range of motion of the patient shoulder based on analysis of the updated modified shoulder model including determining an expected interaction between the virtual representation of the humerus implant and the virtual representation of the glenoid implant after the selected virtual humeral implant and the selected virtual glenoid implant are virtually implanted;
• select, using the system and in response to determining that the range of motion is not within the desired range, at least one of a second humeral implant and a second glenoid implant;
• and
• determine, when the range of motion is not within the desired range, a second range of motion of the patient shoulder based on analysis of the updated modified shoulder model including determining an expected interaction between the virtual representation of the second humerus implant and the second humeral implant and the second glenoid implant.