Figure 9
Formation of large osteochondral defect at 6 month after surgery using μMRI at 9.4 T. A large osteochondral defect (+) has formed six month after failed marrow stimulation of full-thickness chondral defect. The development of this large subchondral cyst in the subarticular spongiosa was associated with a subsequent collapse and complete resorption of the subchondral bone plate at the basis of the cartilage defect (dashed line). Asterisks (*) indicate the extent of the cartilage defect. Axial (a); coronal (b) and sagittal plane (c); SGE sequence, isotropic voxel size 120 μm3. Scale bar = 4 mm.