Abstract: A method for registering a bone is provided that includes the installation of two or more registration markers on an exposed portion of the bone as part of a first stage of a revision. An image data set of the bone is generated to create imaged registration markers. A surgical plan is generated for implanting one or more secondary implants in a second stage of the two-stage procedure based on the image data. The bone is registered to the surgical plan and a computer-assist device using the two or more registration markers by: digitizing a set of positions of the two or more registration markers to create digitized registration markers; and mapping the set of positions of the digitized registration markers with a corresponding set of positions of the imaged registration markers. A system for performing the method is provided. Implant revision is promoted through the use of the method.

Abstract: A process is provided to recover a bone-to-image, image-to-system, and/or bone-to-system registration, when bone movement occurs during a computer-assisted surgical procedure. The process may be implemented with a computer-assisted surgical system. Examples of surgical systems that can exploit the recovery process illustratively include a 1-6 degree of freedom hand-held surgical system, a navigated surgical system, a serial-chain manipulator system, a parallel robotic system, or a master-slave robotic system.

Abstract: A method and system are provided that assesses the quality of implant placement intraoperatively, determines the accuracy of a prepared implant cavity, and alerts a user of an impending bone fracture during computer-assisted orthopedic surgery. The method and system improve the quality of implant placement in a bone compared to conventional techniques by utilizing force feedback acquired while robotically inserting the implant in the bone.