Three-dimensional patterns of early acetabular cartilage damage in hip dysplasia; a high-resolutional CT arthrography study S. Tamura, T. Nishii, T.

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General Information Osteoarthritis and Cartilage

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Three-dimensional patterns of early acetabular cartilage damage in hip dysplasia; a high-resolutional CT arthrography study S. Tamura, T. Nishii, T. Shiomi, Y. Yamazaki, K. Murase, H. Yoshikawa, N. Sugano Osteoarthritis and Cartilage Volume 20, Issue 7, Pages 646-652 (July 2012) DOI: 10.1016/j.joca.2012.03.015 Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 The center of the acetabular dome was defined by fitting a spherical ball of an appropriate radius (green lines) to the acetabulum on the axial/coronal/sagittal reconstructed images. Acetabular cartilage was highlighted in red. Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Color map of acetabular cartilage thickness overlaid on the cartilage model (A). Radial regions and lateral/medial zones were defined by a projected image from the center of the acetabular dome (B). Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Holes (white arrows) were drilled on the acetabular cartilage as markers (A). Cartilage thickness of each plug measured by microscopy (anatomical measurement) was defined as (a + b + c)/3 (B). Black arrows represent the cartilage–bone interface. Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 The 3D patterns of acetabular cartilage thickness divided by the LM ratio at Z3: ‘Convex pattern’ (1.4 ≤ LM ratio), ‘Flat pattern’ (1.0 ≤ LM ratio < 1.4), and ‘Concave pattern’ (LM ratio < 1.0). Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Bland–Altman plots of differences in cartilage thickness between CT arthrography and anatomical measurements. Horizontal axis represents the mean value of CT arthrography and anatomical measurements. Vertical axis represents the difference in the values between anatomical measurement and CT arthrography measurement. Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Cartilage thickness in the lateral and medial zones in each region in pre-stage of osteoarthritis (N = 21) (A) and early stage of osteoarthritis (N = 11) (B). Error bars represent 95% confidence intervals. *P < 0.05. Osteoarthritis and Cartilage 2012 20, 646-652DOI: (10.1016/j.joca.2012.03.015) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions