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Light micrographs of femoral insertion sites of the anterior cruciate ligament (ACL) (haematoxylin and eosin). (A) Group with collagen induced arthritis (×100). Photomicrograph shows bone resorption around the bone-pannus at the peripheral margins of the ligament insertion site and the enlarged mineralised fibrocartilage zone. (B) Enlarged vascular foramina with inflammatory cell infiltration in cortical bone beneath the ACL insertion is shown (×200). (C) Control group (×100).
