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Technical Brief

Sagittal Fluoroscopy for the Assessment of Hindfoot Kinematics

[+] Author and Article Information
Benjamin D. McHenry

Department of Biomedical Engineering,
Marquette University,
1515 W. Wisconsin Avenue,
Milwaukee, WI 53233
e-mail: ben.mchenry@mu.edu

Emily Exten

Department of Orthopaedics,
Meriter-UnityPoint Health,
6408 Copps Avenue,
Monona, WI 53716
e-mail: elexten@aol.com

Jason T. Long

Department of OT/PT,
Cincinnati Children's Hospital Medical Center,
3430 Burnet Avenue,
Cincinnati, OH 45229;
Department of Orthopaedic Surgery,
Cincinnati Children's Hospital Medical Center,
3430 Burnet Avenue,
Cincinnati, OH 45229
e-mail: jason.long@cchmc.org

Gerald F. Harris

Department of Biomedical Engineering,
Marquette University,
1515 W. Wisconsin Avenue,
Milwaukee, WI 53233
e-mail: gerald.harris@marquette.edu

1Corresponding author.

Manuscript received March 25, 2015; final manuscript received December 29, 2015; published online January 29, 2016. Assoc. Editor: Paul Rullkoetter.

J Biomech Eng 138(3), 034502 (Jan 29, 2016) (6 pages) Paper No: BIO-15-1129; doi: 10.1115/1.4032445 History: Received March 25, 2015; Revised December 29, 2015

Current methods of quantifying foot kinematics during gait typically use markers placed externally on bony anatomic locations. These models are unable to analyze talocrural or subtalar motion because the talus lacks palpable landmarks to place external markers. Alternative methods of measuring these clinically relevant joint motions are invasive and have been limited to research purposes only. This study explores the use of fluoroscopy to noninvasively quantify talocrural and subtalar sagittal plane kinematics. A fluoroscopy system (FS) was designed and built to synchronize with an existing motion analysis system (MAS). Simultaneous fluoroscopic, marker motion, and ground reaction force (GRF) data were collected for five subjects to demonstrate system application. A hindfoot sagittal plane model was developed to evaluate talocrural and subtalar joint motion. Maximum talocrural plantar and dorsiflexion angles averaged among all the subjects occur at 12% and 83% of stance, respectively, with a range of motion of 20.1 deg. Maximum talocrural plantar and dorsiflexion angles averaged among all the subjects occur at toe-off and 67% of stance, respectively, with a range of motion of 8.7 deg. Based on the favorable comparison between the current fluoroscopically measured kinematics and previously reported results from alternative methods, it is concluded that fluoroscopic technology is well suited for measuring the sagittal plane hindfoot motion.

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Copyright © 2016 by ASME
Topics: Kinematics
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Figures

Grahic Jump Location
Fig. 1

System configuration (left) showing the embedded force plate with global X and Y coordinates (Z is the cross product of X and Y), emitter, image intensifier, and the digital camera. Foot position (right) showing the fluoroscopic image plane and sagittal motion plane of the foot which is rotated by foot progression angle (β).

Grahic Jump Location
Fig. 2

Typical fluoroscopic image. POI locations are translated from image coordinates (F1x′, F1z′) to global coordinates (F1X, F1Y, F1Z) using an external marker image (M1x′, M1z′) and global (M1X, M1Y, M1Z) coordinate locations, as well as the IM, subject foot progression angle (β, calculated from external markers), and camera static angular rotation from global (θ).

Grahic Jump Location
Fig. 3

Fluoroscopic markers and local coordinate axes. F1 and F2 represent the fluoroscopic marker locations for the talus, while F3 and F4 represent the fluoroscopic marker locations for the calcaneus. Local coordinate axes for the tibia, talus, and calcaneus are also shown. Local k-axes (not shown) are the cross of local i-axes with local j-axes.

Grahic Jump Location
Fig. 4

Talocrural (left) and subtalar (right) plantar/dorsiflexion angles (single subject, four trials)

Grahic Jump Location
Fig. 5

Talocrural (left) and subtalar (right) plantar/dorsiflexion angles (five subjects, four trials per subject)

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