Computer-assisted shoulder surgery and method

A system for computer-assisted guidance in glenohumeral joint surgery comprising:

• a processor unit, and
• a non-transitory computer-readable memory communicatively coupled to the processor and comprising computer-readable program instructions executable by the processor unit for:
• obtaining a natural range of motion profile for the glenohumeral joint by tracking movement of a humerus relative to a scapula of the glenohumeral joint in a non-invasive natural state;
• in an intra-operative phase of the glenohumeral joint surgery:
• registering intra-operatively the humerus and the scapula to a referential system for tracking of the humerus and the scapula relative to the referential system,
• fitting the natural range of motion profile to the humerus and the scapula in the referential system, and
• creating an intraoperative range of motion profile for the glenohumeral joint by tracking movement of the humerus relative to the scapula of the glenohumeral joint in the referential system;
• and
• outputting the intraoperative range of motion for the glenohumeral joint as a function of the natural range of motion, the intraoperative range of motion for the glenohumeral joint as a function of the natural range of motion being expressed in a percentage and/or in degrees.