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Surveillance/navigation systems presently used make extensive use of television, infrared, and other line-of-sight-surveillance hardware. However, these systems cannot tell what is happening or locate persons/assets on the other side of a wall, behind bushes, in the dark, in a tunnel or a cave, or through a dense fog. It is our objective here to develop a(More)
A method was developed for registering three-dimensional knee implant models to single plane X-ray fluoroscopy images. We use a direct image-to-image similarity measure, taking advantage of the speed of modern computer graphics workstations to quickly render simulated (predicted) images. As a result, the method does not require an accurate segmentation of(More)
The objective of the current study was to use fluoroscopy and computed tomography to accurately determine the three-dimensional, in vivo, weightbearing kinematics of five normal knees. Three-dimensional computer-aided design models of each subject's femur and tibia were recreated from the three-dimensional computed tomography bone density data.(More)
Obtaining 3D patient-specific bone models from 2D image data (e.g. X-rays, fluoroscope) remains a practical and desirable alternative to segmentation of bone models from 3D image data (e.g. CT, MRI). It also provides an initial step to automatically calculating the relevant axes and angles needed in computer aided surgery (CAS). Our method utilizes a(More)
BACKGROUND Studies have demonstrated sex differences in femoral shape and quadriceps angle raising a question of whether implant design should be sex-specific. Much of this research has addressed shape differences within the Caucasian population and little is known about differences among ethnic groups. QUESTIONS/PURPOSES We therefore asked: Do shape(More)
An in vivo comparison of flexion kinematics for posterior cruciate-retaining (PCR) and posterior stabilized (PS) total knee arthroplasty (TKA) was performed. Twenty patients who underwent bilateral paired TKAs were included in this prospective study. Both PCR and PS prostheses were from the same TKA series with comparable surface geometries, and all were(More)
For many medical procedures 3D bone models are built from Computed Tomography (CT) or Magnetic Resonance Imaging (MRI) data, both of which are expensive and time consuming, and unavailable in most operating rooms. We propose 3D tomographic reconstruction from fluoroscopy as an alternative to CT and MRI. Although there are fluoroscopy machines that can(More)