Fig. 7

Histology of the cross sections. The cross sections of a 0.5-mm (a) and 1.5-mm (b) defect after HE and toluidine blue staining, respectively, show precise and smooth sides of the cartilage walls. The bottoms seem plane despite the slight undulating surface of the cartilage (a) and irregularities of the uncovered cancellous bone (b). The vertical sides and the bottom are perpendicular at the corners. Magnification 2.5×