ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

Fig.1: Frontal view on all subchondral bone surfaces relative based on the plane of the joint surface. The
colour indicates the different bone distances (colourbar [mm]). At the top, the joint surfaces of the right
side (PSJR, AMSJR, CCJR) and at the bottom the joint surfaces of the left side (PSJL, AMSJL, CCJL)
are shown.
Fig.2: Right calcaneus and the associated joint areas
The area and 3D orientation of the three separated subchondral bone areas of the joint
surfaces were calculated. Based on these results, the percentage of directional
asymmetry (%DA) between the right and the left hind foot was calculated. This method
standardizes all raw asymmetric differences to %DA for direct comparison of
asymmetries in dimensions of different size [15].
%DA = (right – left)/(average of left and right) x 100
The results of the area and 3D orientation of all separated subchondral bone areas of the
joint surfaces were statistically analysed with a paired t-test (alpha = 0.05).
RESULTS
Intraindividual differences (%DA) for the subchondral bone area of the joint surface
areas, were less than -3 %DA for the PSJ, -1 %DA for the AMSJ and -3 %DA for the
CCJ. Differences in 3D orientation of the joint surface were between -1 %DA and 1
%DA. None of these differences was statistically significant. Interindividual variations