Group Title: Journal of Foot and Ankle Research 2008, 1 (Suppl 1): O33
Title: In vivo talocrural and subtalar kinematics during nonweightbearing and weightbearing dorsiflexion-plantarflexion activities
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 Material Information
Title: In vivo talocrural and subtalar kinematics during nonweightbearing and weightbearing dorsiflexion-plantarflexion activities
Series Title: Journal of Foot and Ankle Research 2008, 1 (Suppl 1): O33
Physical Description: Archival
Creator: Yamaguchi S
Sasho T
Kato H
Banks SA
Publication Date: 9/26/2008
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Bibliographic ID: UF00100227
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: Open Access: http://www.biomedcentral.com/info/about/openaccess/

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Oral presentation
In vivo talocrural and subtalar kinematics during
nonweightbearing and weightbearing dorsiflexion-plantarflexion
activities
S Yamaguchi1, T Sasho2, H Kato3 and SA Banks*"

Address: 'Department of Mechanical and Aerospace Engineering, University of Florida, USA, 2Department of Orthopaedic Surgery, Graduate
School of Medicine, Chiba University, Japan and 3Department of Radiological Technology, Chiba University Hospital, Japan
Email: SA Banks* banks@ufl.edu
* Corresponding author



from I st Congress of the International Foot & Ankle Biomechanics (i-FAB) community
Bologna, Italy. 4-6 September 2008

Published: 26 September 2008
journal of Foot and Ankle Research 2008, I(Suppl 1):033 doi:10.l 186/1757-1146-1-SI-033


This abstract is available from: http://www.jfootankleres.com/content/ I/S I/O33
2008 Yamaguchi et al; licensee BioMed Central Ltd.


Introduction
Understanding of the effect of weightbearing on the kine-
matics of the subtalar and talocrural joints is critical for
the diagnosis and treatment of foot and ankle disorders.
However, precise kinematics of these joints during
dynamic activities in vivo is not well studied. The purpose
of this study was to compare in vivo kinematics of these
joints during nonweightbearing and weightbearing activi-
ties in healthy subjects.

Methods
Seven healthy subjects with a mean age of 32 7 years
were enrolled. Nonweightbearing and weightbearing
activities from dorsiflexion to plantarflexion were
recorded with oblique lateral fluoroscopy at 7.5 frames/
sec. Geometric bone models of the tibia/fibula, talus, and
calcaneus were created from CT images of the subject.
Anatomic coordinate systems were embedded in each
bone model. Three dimensional kinematics of the subta-
lar, talocrural, and ankle joint complex were determined
using 3D-2D model registration techniques (Figure 1)
[1,2]. Bone models were projected onto the distortion-
corrected fluoroscopic image, and three dimensional
positions and orientations of the bones were determined
by matching the silhouette of the bone models with the
silhouette of the image.


Results
During the nonweightbearing activity from 20 of dorsi-
flexion to 150 of plantarflexion of the ankle, the subtalar
joint everted by 4 and dorsiflexed by 2 The talocrural
joint inverted by 3 plantarflexed by 320, and adducted


Figure I
Shape matching of the talus and calcaneus.



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Journal of Foot and Ankle Research 2008, 1(Suppl 1):033


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Figure 2
Subtalar joint inversion and adduction during nonweightbearing and weightbearing activities. *Significant differ-
ences in repeated measures ANOVA. oSignificant differences in post-hoc pair-wise comparisons.


by 7 During the weightbearing activity, the subtalar joint
was significantly more everted, (7-8 of difference, Figure
2), dorsiflexed (3-50), and abducted (3-40, Figure 2)
than during nonweightbearing activity. The talocrural
joint was significantly more plantarflexed (7-80) and
adducted (2-5 o) during weightbearing activity. Publish with Bi ed Central an every
Publish with BioMed Central and every
Conclusion scientist can read your work free of charge
Conclusion
Coupled motion of the subtalar and talocrural joints dur- "BioMed Central will be the most significant development for
disseminating the results of biomedical research in our lifetime.
ing weightbearing activity serves to maximize joint con-
Sir Paul Nurse, Cancer Research UK
tact area and stabilize the subtalar joint. 3D-2D model
registration techniques appear to be useful tools for the Your research papers will be:
quantitative analysis of the talocrural and subtalar kine- available free of charge to the entire biomedical community
matics during dynamic activities. peer reviewed and published immediately upon acceptance
Cited in PubMed and archived on PubMed Central
References yours you keep the copyright
1. Banks SA, et al.: IEEE Trans Biomed Eng 1996, 43(6):638-649. Submit your manuscript here: BioMedcentra
2. Moro-oka T, et al.:J Orthop Res 2006, 25(7):867-872. http://www.biomedcentral.com/nfo/publishingadv.asp


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