Fig. 2.

Safranin O fast green dyed, × 60 magnified histologic images of the samples. Control group demonstrates scarce healing tissue. MIV and MIV + collagenase groups demonstrate mature columnar cartilage structure. The well-formed cartilage structure seen on the MIV + collagenase group was not homogenous throughout the lesion but was in forms of islets. In contrast, the structure seen on the picture was homogenous throughout the lesion area in the MIV group. MIV + collagenase + GF group has a less organized structure with remnants of the collagen membrane on the surface. The MACI group shows less organized but satisfactorily thick healing. The structure was homogenous throughout the lesion area