Fig. 5.

A: T₂ map acquired by CPMG, pseudo-colour-coded and overlaid on a morphological image of a 41-year-old patient with Pridie drilling on the medial femoral condyle (TE = 11.9 ms); the ratio of native and lesion cartilage T₂s is 0.81. B: T₂ map acquired by 3D-TESS, pseudo-colour-coded and overlaid on the second acquired MR image (F₀); the ratio of native and lesion cartilage T₂s is 0.83. Focal increase in T₂ values is observable with both techniques (’lesion’). Bone oedema is also present (large arrow). The dynamic range of the CMPG T₂ map is higher compared to the 3D-TESS T₂ map, therefore, the lesion appears to be more diffuse, although the ratios of native and lesion cartilage T₂s are comparable between CPMG and 3D-TESS