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Intra-operative verification of the glenoid implant position with structured light imaging in total shoulder arthroplasty (Bullseye)

Positioning of the glenoid component is one of the most challenging steps in total shoulder arthroplasty. Prosthetic longevity as well as functional outcomes are considered highly dependent on accurate positioning. Currently, there are no adequate means to verify the position of the glenoid component intra-operatively which is a significant impediment to accurate positioning. To address this clinical need we have developed Bullseye, a novel intra-operative imaging system that utilizes a hand-held structured light sensor and computer vision algorithms to verify the 3D position of the glenoid vault guide pin prior to preparation of the glenoid for component implantation.

Optical tracker on a sawbone scapula, structured light image of the scapula and optical tracker, registration of optical glenoid surface image to CT data, registration of optical fiducial image to its computer model, 3D model of registered fiducial and predicted guidepin position, predicted (green) and actual guidepin position for sagittal, axial, and coronal planes.a) Optical tracker on a sawbone scapula, b) structured light image of the scapula and optical tracker, c) registration of optical glenoid surface image to CT data, d) registration of optical fiducial image to its computer model, e) 3D model of registered fiducial and predicted guidepin position, f-h) predicted (green) and actual guidepin position for sagittal, axial, and coronal planes.