Abstract
A virtual training system has been developed to train novice surgeons on using the new jig and fixture in a knee replacement surgery. In this study, we described how a virtual hand was employed in a Virtual Knee Replacement Surgery Training System. The virtual hand is equipped with HOMER-G, a selection and manipulation technique that combines the Arm-extension and Ray-casting technique for easy selection and manipulation of virtual object with the virtual grasping capability during selection task. The virtual jig and fixture are selected using Ray- casting technique and the arm extension technique of HOMER-G will help to manipulate the object. The virtual hand's movement is controlled by a data glove and Flock of Birds tracking device. HOMER-G has the grasping capability that makes the manipulation of object looks more natural.
Highlights
Virtual environment provided an intuitive way for human-computer interaction
The difference between HOMER and HOMER-G is HOMER-G has an additional virtual grasping capability in the selection task. This new ability increased the nature of virtual hand movement and provides a better visual feedback to the user
In HOMER-G, when the object is shot by the ray from virtual hand, the virtual hand will start moving towards the object
Summary
Virtual environment provided an intuitive way for human-computer interaction. Mine (1995) had identified three major categories of interaction technique in a virtual world. A virtual training system for newly designed jig and fixture usage in computer assisted knee replacement surgery was developed. A virtual training system was developed to assist the computer-assisted knee surgery where the user can interact with virtual environment to determine the optimum position of the jig at tibia. The armextension technique allows the user to extend their surgery (Slack and Bates, 1998) In this research, they generated the virtual model based on MRI dataset of real patient. A great deal of research effort has been directed toward developing virtual reality surgery training in recent years and various interaction techniques have been applied. Surgery (MIS) makes unique demands on surgical training programs and that inspired the researcher to develop a virtual reality simulation for operating room (Gallagher et al, 2005). Change in real-time using finite-element analysis and offers realistic tactile feedback using tailor-made force
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