Post-ex 9: Pathological Lesion

Back to work today, a day and night of lying flat has sorted my back for the moment (still trying not to sit at the keyboard too much, so sorry for lack of commenting).
I knew that I would try for the Challenge2011 picture today, but as usual there was little of interest in the material I was recording :^/

There was this osteochondritis dissecans lesion on the distal joint surface of a tibia, so that's what I'm blipping.