Fast, robust, and accurate monocular peer-to-peer tracking for surgical navigation.

Purpose: This work presents a new monocular peer-to-peer tracking concept overcoming the distinction between tracking tools and tracked tools for optical navigation systems. A marker model concept based on marker triplets combined with a fast and robust algorithm for assigning image feature points to the corresponding markers of the tracker is introduced. Also included is a new and fast algorithm for pose estimation.

Computer aided planning of orthopaedic surgeries: the definition of generic planning steps for bone removal procedures.

Purpose: An increasing number of orthopaedic surgeons are using computer aided planning tools for bone removal applications. The aim of the study was to consolidate a set of generic functions to be used for a 3D computer assisted planning or simulation.

Methods: A limited subset of 30 surgical procedures was analyzed and verified in 243 surgical procedures of a surgical atlas.

How deep can straight instruments be inserted into the femoral canal: a simulation study based on cadaveric femora.

Determining how deep instruments can be inserted into the femoral canal without touching adjacent structures is a fundamental necessity for navigating instruments in primary and revision total hip arthroplasty. The aim of the study was to determine the reachable depth of a straight instrument inserted into the femur canal during primary and revision total hip arthroplasty. Based on the three-dimensional data of twenty-six femurs, obtained from a CT scan, the insertion depth of a virtual, straight instrument was accessed by a simulation.

The use of time-of-flight camera for navigating robots in computer-aided surgery: monitoring the soft tissue envelope of minimally invasive hip approach in a cadaver study.

Background: Time-of-flight (TOF) cameras can guide surgical robots or provide soft tissue information for augmented reality in the medical field. In this study, a method to automatically track the soft tissue envelope of a minimally invasive hip approach in a cadaver study is described.

Methods: An algorithm for the TOF camera was developed and 30 measurements on 8 surgical situs (direct anterior approach) were carried out.

Hemispheric cups do not reproduce acetabular rim morphology.

Background: Iliopsoas impingement is a recurrent complication following THA, caused by muscle friction against a protrusive prosthetic cup.This study was designed to quantify the dimensional variations in acetabular rim profiles, with particular regard to the iliopubic valley, in order to suggest means to prevent iliopsoas impingement.

Material And Methods: 34 cadaver pelvises were analyzed using a hip navigation system.