Abstract: A system including a registering device for registering a center of rotation of a hemispheric reamer in computer-assisted surgery may include: a hollow body defining an inner cavity having an open end configured for receiving a hemispheric reamer therethrough. The inner cavity has a frustoconical or conical abutment surface of a right circular cone having a central axis, the frustoconical or conical abutment surface configured for abuttingly receiving the hemispheric reamer therein. When the hemispheric reamer is at a closest point to an apex of the right circular cone while abuttingly received against the frustoconical or conical abutment surface, a center of rotation of the hemispheric reamer is on the central axis of the right circular cone, whereby a concurrent tracking of the registering device and of the hemispheric reamer sets the center of rotation for the hemispheric reamer.

Abstract: Techniques for robotically guiding a cup-shaped implant or instrument are provided. In an example, the technique can include a combination of the following operations. Acquiring a calibration image including a cup-shaped element in a first orientation. Identifying a first elliptical outline of the cup-shaped element. Acquiring a navigation image including the cup-shaped element in a second orientation. Identifying a second elliptical outline of the cup-shaped element. Aligning a coordinate system of a robotic system to a patient, and positioning an implant or instrument based on a pre-operative plan within the coordinate system.

Abstract: Techniques for robotically guiding a cup-shaped implant or instrument are provided. In an example, the technique can include a combination of the following operations. Acquiring a calibration image including a cup-shaped element in a first orientation. Identifying a first elliptical outline of the cup-shaped element. Acquiring a navigation image including the cup-shaped element in a second orientation. Identifying a second elliptical outline of the cup-shaped element. Aligning a coordinate system of a robotic system to a patient, and positioning an implant or instrument based on a pre-operative plan within the coordinate system.

Abstract: Techniques for robotically guiding a cup-shaped implant or instrument are provided. In an example, the technique can include a combination of the following operations. Acquiring a calibration image including a cup-shaped element in a first orientation. Identifying a first elliptical outline of the cup-shaped element. Acquiring a navigation image including the cup-shaped element in a second orientation. Identifying a second elliptical outline of the cup-shaped element. Aligning a coordinate system of a robotic system to a patient, and positioning an implant or instrument based on a pre-operative plan within the coordinate system.