. Calcified tissues; proceedings. Bone; Collagen; Calcification. Experimental Studies of the Non-inflammatory Vascular Pannus 65 Series III: Fig. 3 illustrates the case of an animal (11) sacrificed 56 days after low cervical osteotomy. The fracture had healed spontaneously with external tilting of the head. In the metaphyseal marrow, which was poorly vascularized, a few enlarged veins were visible. Hemopoietic tissue was absent, and the internal part of the cortex had become spongy. The articular space was greatly enlarged. The territory of the artery of the ligamentum teres formed a triangle
. Calcified tissues; proceedings. Bone; Collagen; Calcification. Experimental Studies of the Non-inflammatory Vascular Pannus 65 Series III: Fig. 3 illustrates the case of an animal (11) sacrificed 56 days after low cervical osteotomy. The fracture had healed spontaneously with external tilting of the head. In the metaphyseal marrow, which was poorly vascularized, a few enlarged veins were visible. Hemopoietic tissue was absent, and the internal part of the cortex had become spongy. The articular space was greatly enlarged. The territory of the artery of the ligamentum teres formed a triangle of densified bone, and the ligament and its insertion in the socket were en- larged. From it, as well as from the articular capsule, fibrovascular growths (vascular pannus) emer- ged. This pannus war irregularly developed and hyalinized over 2/3 of its course. The action of the internal pannus upon the modifi- cation of the external table of the socket is especially visible at this magnification. The internal extremity of the coxo-femoral articulation was ob- literated by a congested external capsular pannus (Fig. 2 b) in front of which the cartilage underwent a lysis and was split longitudinally into two sheets of equal thickness. The marrow was markedly con- gested and showed fibro-vascular sprouts eroding the terminal plate and reaching the cartilage (internal pannus). Fig. 4 (rabbit 5) shows the effect of the operation after 28 days. A well limited medullary territory showed congestion, plasmostasis, and reticular hyperplasia as well as absence of hematopoiesis. An avascular layer of cuboidal cells covered the cartilage of the femoral head; the latter showed zones of chondrocytic activation and chondrolysis which, in 2 foci, had formed cysts. Serial sections showed these cysts to have no topographical relation to the articular surface or to the blood vessels. The results of Series I, II, and III show that a local reduction of circulation modifies the different tissues of an
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