Safranin-O stained histological section of the operated (ACLX) and un-operated knee (LEFT) 3 months post-surgery. Note, the remaining fragment of trabecular bone (left, arrow) within the cyst region and the lack of viable osteocytes within the surrounding bone (arrowheads), which indicates focal osteonecrosis. Scale bar = 250 μm. ACLX, anterior cruciate ligament transection with partial medial meniscectomy.
McErlain et al. Arthritis Research & Therapy 2012 14:R26 doi:10.1186/ar3727