Sections from the knees of 7-month-old rats subjected to ovariectomy, stained with Toluidine blue, showing the distal femur and proximal tibia (a,b) with the meniscus (M) to the left (a). The surface erosion is indicated by the long, thin black bar (b). Scale bars: 200 μm.
Høegh-Andersen et al. Arthritis Res Ther 2004 6:R169-R180 doi:10.1186/ar1152