Fig. 8.

(a–d) Bland– Altman – plot comparing the methods of imaging concerning cartilage defects (measured in mm²). The graph displays a scatter diagram of the differences plotted against the mean of the two methods measurements of defect size in two different imaging modalities. (a) Comparing measurement in specimen and CTA. Limits of agreement were set 2.3 and −6. Mean was calculated −1.833. (b) Measurement in Specimen and 3D model were compared. Limits of agreement were set 2.57 and −7.23. Mean was calculated −2.33. (c) Measurement in Specimen was compared to 3 T MRI. The Limits of agreement were set 6.14 and −7.14. Mean was calculated −0.5. (d) Comparing measurement in CTA to 3D model. Limits of agreement were set −2.59 and 21.91. Mean was calculated 9.66.