Introduction: We are developing a pre-operative planning system for shoulder replacement surgery that simulates patient-specific bone-determined range of motion (ROM). With this system the surgeon can perform virtual shoulder surgery and explore outcomes and restrictions. By doing so, the risk of impingement complications is reduced and the post-operative ROM of the shoulder can be maximized. During computer navigated surgery of the shoulder, marker trees are attached to the humerus and scapula. Registration of the shoulder can be performed by matching specific bony landmarks on the shoulder to corresponding landmarks on a surface model that is generated using a pre-operative CT scan. The goal of this work is to estimate the registration error that we are likely to make under ideal conditions using an anatomical landmark-based approach on cadaver scapulae.
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