Abstract
The trapezium shape of the talar dome limits the use of 2-dimensional plain radiography
for morphometric assessment because only 2 of the 4 required parameters can be measured.
We used computed tomography data to measure the 4 morphologic parameters of the trochlea
tali: anterior width, posterior width, trochlea tali length, and angle of trapezium
shape. A total of 99 subjects underwent computed tomography scanning, and the left
and right talus bones were both virtually modeled in 3 dimensions. The 4 morphologic
parameters were measured 3 times each to obtain the intraclass correlation, and analysis
of variance was used to check for any significant differences between the repeated
measurements. The average intraclass correlation coefficient for the measurements
for 2 to 3 trials was 0.94 ± 0.04. Statistical analyses were performed on the data
from all 198 talus bones using SAS software, comparing male and female and left and
right bones. All 4 morphometric values were greater in the male group. No significant
differences were found between the left and right talus bones. A strong positive correlation
was observed between the trochlea tali length and the anterior width. The angle of
trapezium shape showed no correlation with the other 3 parameters. The measurements
were compared with the dimensions of the current talar components of 4 total ankle
arthroplasty implants. However, most of them did not perfectly match the trapezium
shape of the talus from our population. We successfully analyzed the trapezium shape
of the trochlea tali using reliable virtual 3-dimensional measurements. Compared with
other published reports, our study showed a relatively smaller dimension of the trochlea
tali than the European counterparts.
Level of Clinical Evidence
Keywords
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Article info
Publication history
Published online: April 29, 2013
Footnotes
Financial Disclosure: None reported.
Conflict of Interest: None reported.
Identification
Copyright
© 2013 American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.
