Volume 7 Supplement 1

4th Congress of the International Foot and Ankle Biomechanics Community

Open Access

Measuring foot and ankle kinematics using a bi-plane fluoroscopic system

Journal of Foot and Ankle Research20147(Suppl 1):A46

https://doi.org/10.1186/1757-1146-7-S1-A46

Published: 8 April 2014

Background

Accurate measurements of skeletal kinematics of the foot would increase our understanding on the interaction between foot and footwear. Previously foot kinematics was measured using reflective markers but the method had inherent limitation of skin marker-based methods. Recently fluoroscopic imaging-based methods has been developed and widely used to measure knee kinematics [1, 2]. We have made a bi-plane fluoroscopic imaging system and a walkway where continuous foot X-ray images could be taken during walking. The objective of the study was to understand the possibility of bi-plane fluoroscopic system for measuring foot and ankle kinematics.
Figure 1

Bi-plane fluoroscopic imaging system and walking (left) and the calculation results for the positions and orientations of talus, calcaneus, navicular and tibia (right)

Methods

The walkway was made of high density polystyrene foam, whose size was 1.2 m, 0.6 m and 4.0 m for height, width and length, respectively. The target foot position was marked on the walkway and the directions of the two X-ray imaging systems were carefully determined to capture the silhouettes of talus, calcaneus, navicular and tibia during the stance phase of walking. The study was approved by the IRB at Chung-Ang University. An informed consent was obtained from each volunteer prior to testing. Subjects walked on the walkway at their self-selected normal speed and the bi-plane fluoroscopic images were taken for 2 seconds. Images for calculating geometric calibration of the imaging system were taken. The subjects underwent computed tomographic (CT) imaging and three-dimensional bone models were obtained. A semi-automatic and manual registration methods were used to determine the positions and orientations of the four target bones for each frame of the bi-plane images during the stance phase of walking. The quality of silhouettes of the bones varied throughout the stance phase.

Results

Ten subjects (age 21.5±1.9, all males, BMI 21.7±1.9) volunteered for the study. The registration results showed some degrees of vibration of the bones, motion noise. The general trend of foot and ankle kinematics could be observed.

Conclusions

Foot and ankle skeletons could be imaged during the stance phase of walking using a bi-plane fluoroscopic system set-up along a polystyrene foam walkway. The positions and orientations of the foot and ankle bones could be calculated from the bi-plane images but the results showed some degrees of noise in their motions.

Declarations

Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP) (No. 2013R1A2A2A03015668).

Authors’ Affiliations

(1)
School of Mechanical Engineering, Chung-Ang University
(2)
Department of Orthopedic Surgery, Seoul National University Bundang Hospital

References

  1. Tashman S, Collon D, Anderson K, Kolowich P, Anderst W: Abnormal rotational knee motion during running after anterior cruciate ligament reconstruction. Am J Sports Med. 2004, 32: 975-983. 10.1177/0363546503261709.View ArticlePubMedGoogle Scholar
  2. Li G, Wuerz TH, DeFrate LE: Feasibility of using orthogonal fluoroscopic images to measure in vivo joint kinematics. J Biomech Eng. 2004, 126: 314-318.View ArticlePubMedGoogle Scholar

Copyright

© Koo and Lee; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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