Cancellous bone changes in hip osteoarthritis: a short-term longitudinal study using fractal signature analysis C.D. Papaloucas, M.D., Ph.D., R.J. Ward,

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Cancellous bone changes in hip osteoarthritis: a short-term longitudinal study using fractal signature analysis C.D. Papaloucas, M.D., Ph.D., R.J. Ward, Ph.D., C.J. Tonkin, D.C.R.(R), C. Buckland-Wright, D.Sc. Osteoarthritis and Cartilage Volume 13, Issue 11, Pages 998-1003 (November 2005) DOI: 10.1016/j.joca.2005.06.009 Copyright © 2005 OsteoArthritis Research Society International Terms and Conditions

Fig. 1 Diagram of a femoral head showing the position of the 6×6mm ROI used to calculate the FSA for vertical and horizontal trabeculae. Osteoarthritis and Cartilage 2005 13, 998-1003DOI: (10.1016/j.joca.2005.06.009) Copyright © 2005 OsteoArthritis Research Society International Terms and Conditions

Fig. 2 Graph of the mean differences in fractal dimension for vertical trabecular structures between baseline and exit macroradiograph. The values for the CI lines that do not cross the abscissa correspond to statistically significant changes in the fractal dimension for those sizes of trabeculae. Osteoarthritis and Cartilage 2005 13, 998-1003DOI: (10.1016/j.joca.2005.06.009) Copyright © 2005 OsteoArthritis Research Society International Terms and Conditions

Fig. 3 Graph of the mean differences in fractal dimension for horizontal trabecular structures between baseline and exit radiograph. There were no statistically significant changes in the fractal dimension of horizontal trabeculae during the study period. Osteoarthritis and Cartilage 2005 13, 998-1003DOI: (10.1016/j.joca.2005.06.009) Copyright © 2005 OsteoArthritis Research Society International Terms and Conditions

Fig. 4 Part of a macroradiograph of the centre of the femoral head showing the cancellous changes in the ROI used in quantifying alterations in bone structure. (A) Baseline radiograph (B) 18 months later showing thickened coarse vertical trabeculae and an overall reduction in trabecular number. The oblique line crossing the image is a scanning artefact. Original magnification ×3.4, reproduced at ×5.8. Osteoarthritis and Cartilage 2005 13, 998-1003DOI: (10.1016/j.joca.2005.06.009) Copyright © 2005 OsteoArthritis Research Society International Terms and Conditions