Accuracy of intraoperative bone registration and stereotactic boundary reconstruction during total knee arthroplasty surgery.

Background: The intraoperative registration of the bones play a crucial role in image-based computer-assisted knee arthroplasty to achieve accurate implant placement and to create reliable stereotactic bone boundaries for robot-assisted surgical systems.

Method: This study assessed the intraoperative registration accuracy on six intact fresh frozen cadavers.

Results: Rotational errors around the mechanical axis were the largest, with a standard deviation of 1.

An improved method for assessing the technical accuracy of optical tracking systems for orthopaedic surgical navigation.

Background: Optical tracking systems (OTSs) are essential components of many modern computer assisted orthopaedic surgery (CAOS) systems but patient movement is often neglected in the evaluation of the accuracy. The aim of this study was to develop a representative test to assess the accuracy of OTSs including patient movement and demonstrate the effect of pointer design and OTS choice.

Method: A mobile phantom with dynamic reference base (DRB) attached was designed and constructed.