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Center for Orthopaedic Biomechanics

High Speed Stereo Radiography

 
Video from the high-speed stereo radiography (HSSR) system of a knee during a pivot activity.

This project supported the realization of a stereo radiography system with large field-of-view detectors and high speed Phantom cameras to enable state-of-the-art measurement of bone and joint motion at a sub-mm level.  The accurate measurement of joint motions in the human body is important to understanding the mechanisms of musculoskeletal diseases, improving orthopeadic treatments and developing safe and reliable medical devices. The system enables sub-mm measurement of the translations and rotations of bone and implants in six degrees of freedom.  Notably, the system has been integrated with traditional motion capture, force plates and electromyography to develop unique biomechanical datasets combining whole body and local joint motion data with forces and muscle activation. 

This project was supported by the National Science Foundation:
MRI: Acquisition of a Biplane Fluoroscopy System for Dynamic Imaging of In-Vivo Human Motion
Investigators: P. Rullkoetter, B. Davidson, C. Fitzpatrick, P. Laz, K. Shelburne.
Grant number: CNS-1229148,  October 2012-October 2014
with cost share provided by the University of Denver.

We are currently enrolling for the following IRB-approved studies:
  • Characterizing the kinematics and loading of the natural and implanted hip
  • Quantification of rear- and mid-foot mobility in vivo using biplane radiography
  • Characterization of intervertebral motion in the lumbar spine
  • Dynamic Shoulder Kinematics During Baseball Throwing in Pitchers
  • Evaluation of Knee Braces for the Conservative Treatment of Ligament Deficiency
  • Dynamic 3D imaging of human knee joint motion using biplane fluoroscopy
  • Evaluation of Postural Intervention for the Conservative Treatment of Rotator Cuff Pathology

Please contact us if you are interested in participating!

subject data collection
Subject participating in a data collection in the HSSR system.

subject data collection
The high speed stereo radiographic (HSSR) system is the centerpiece of the Human Dynamics Laboratory.

pose matching
Kinematics are extracted by matching a reconstruction of the subject's bones to the recorded stereo X-ray images.

knee flexion sequence
Stereo radiographic images of an implanted knee during flexion

Resulting Publications
  • Ivester, Cyr, Harris, Kulis, Rullkoetter, Shelburne. A Reconfigurable High-Speed Stereo-Radiography System for Sub-millimeter Measure of In-vivo Joint Kinematics.  ASME Journal of Medical Devices, in review.
  • Kefala, Cyr, Hume, Shelburne. Assessment of Normal Knee Kinematics during Activities of Daily Living in Older Adults. American College of Sports Medicine. San Diego, CA., submitted.
  • Hume, Cyr, Kefala, Gaffney, Shelburne. Comparison of Marker-based and Stereo Radiography Knee Kinematics in Assessment of Activities of Daily Living. American College of Sports Medicine. San Diego, CA., submitted.
  • Kefala, Cyr, Harris, Gordon, Rullkoetter, Davidson, Shelburne (2014). Implant Tracking using a High Speed Stereo Radiography System. Rocky Mountain American Society of Biomechanics. Estes Park, Colorado.
  • Cyr, Harris, Kefala, Gordon, Rullkoetter, Davidson, Shelburne (2014). Implant Tracking using a High Speed Stereo Radiography System. World Congress of Biomechanics. Boston, MA.
  • Ivester, Rullkoetter, Davidson, Shelburne (2013). Design of a Reconfigurable Biplane Fluoroscopy System. Rocky Mountain American Society of Biomechanics. Estes Park, Colorado.