Figure 3From: Effects of pamidronate disodium on the loss of osteoarthritic subchondral bone and the expression of cartilaginous and subchondral osteoprotegerin and RANKL in rabbits Effects of PAM treatment on cartilage surface erosion. The sections were stained with safranin-O (red stain) for glycosaminoglycans, rapid green for bone. (a) The Sham group had no erosion-like changes in the cartilage surface. (b,c) Short-term and long-term treatment with PAM significantly increased chondrocytes and matrices, while fibroses of the cartilage surface were significantly reduced compared with the ACLT group at 6 and 14 weeks. (d) ACLT group at 2 weeks, no significant changes were observed in the cartilage surface. (e) ACLT group at 4 weeks, staining of safranin O had been partially lost and various degrees of surface fibrosis, cracks, cell loss proliferation were observed in the surface layer of the hyaline cartilage. (f,g) ACLT group at 6 and 14 weeks, chondrocytes of the hyaline cartilage surface were massively reduced, fibroses were extensive, osteophytes had formed, vertical fractures had increased and safranin O staining in the cartilaginous area was significantly reduced. Bar represents 200 μm.Back to article page