Feasibility of Using Orthogonal Fluoroscopic Images to Measure In Vivo Joint Kinematics

[+] Author and Article Information
Guoan Li, Thomas H. Wuerz, Louis E. DeFrate

Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA

J Biomech Eng 126(2), 313-318 (May 04, 2004) (6 pages) doi:10.1115/1.1691448 History: Received June 03, 2003; Revised October 27, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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The 3-D fluoroscopy system: (a) 3-D scanning of the knee; and (b) acquisition of 2-D images with the knee positioned inside the C-arm.
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(a) Reproduction of the relative position of the ball and cylinder using two orthogonal images taken from the 3-D fluoroscope; (b) Determination of knee positions using 3-D knee models and orthogonal images of the knee from anteromedial and posteromedial views.
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This figure shows the effects of slightly mismatching the diameter of the ball in one plane on the position of the ball in the orthogonal plane. A slight mismatch of the position of the ball in plane (a) results in a large error in the position of the ball in the orthogonal plane (b).
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The change in diameter of the ball’s projection on the image intensifier as the ball’s position is changed in perpendicular direction (“−” moving towards and “+” moving away from the orthogonal image intensifier). The center position refers to varying the position of the ball relative to a position located at the isocenter of the fluoroscope, and the close position refers to a position 100 mm closer to the image intensifier.
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(a) Tibiofemoral contact points at different flexion angles during in-vivo weight-bearing lunge of a typical subject; (b) Tibiofemoral contact points of the three subjects versus flexion angle during in-vivo weight bearing lunge (mean±standard deviation). Positive values are anterior to the midline of the medial/lateral tibial plateaus and negative values are posterior to the midline.
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Internal tibial rotation of the three subjects versus flexion angle during in-vivo weight bearing lunge (mean±standard deviation)




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