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Vessels in cartilage canals supplying the articular-epiphyseal cartilage complex and growth plate of the distal part of the humerus of pigs between on day and 15 weeks old were examined in perfused and cleared specimens, and histochemical preparations. An extensive capillary network surrounded the arterioles and venules and probably maintained the circulation of blood as the ends of the cartilage canals underwent involution. Pits and grooves were in predilection sites for osteochondrosis and osteoarthrosis and were typical of early lesions of these conditions. Some ghosts that were observed mesoscopically were chondrified cartilage canals or remnants of cartilage canals in histological sections, and were considered to be the result of a normal process. However, abnormal involution may predispose to chrondrolysis, and the presence of involuting transverse cartilage canals at predilection sites implicated damaged canals in the aetiopathogenesis of osteochondrosis and osteroarthrosis in some pigs. Cleared specimens provided the most useful demonstration of the form and distribution of cartilage canals, ghosts, and pits or grooves. The association of cartilage canals with areas of chondrolysis, and the distribution of ghosts in the predilection sites for lesions, warrant further investigation of blood vessels within cartilage canals.
Vet Rec 1991 Mar 09
PMID:Cartilage canals and lesions typical of osteochondrosis in growth cartilages from the distal part of the humerus of newborn pigs. 204 69

Growth cartilages with dyschondroplastic foci (osteochondrosis) or areas of chondrolysis were selected from the ribs and bones of the appendicular skeleton of 132 commercial pigs euthanased between one and 169 days old or at a liveweight of 100 kg. Histochemical staining techniques that identified proteoglycans, collagen and deposits of calcium enhanced the visualisation of the lesions, were valuable for recognising the distribution of lesions, and helped to elucidate the development of the lesions. On the basis of the histochemical and morphological differences, it was considered that the lesions associated with growth plates and the lesions associated with articular-epiphyseal cartilage complexes should be considered as different entities. Lesions were identified in the articular-epiphyseal cartilage complexes of pigs at 15 days old, earlier than has been reported previously. Toluidine blue and safranin O were more useful than alcian blue and, in terms of staining intensity, toluidine blue gave more consistent results than safranin O.
Vet Rec 1990 Jul 14
PMID:Use of histochemical techniques in the characterisation of osteochondroses affecting pigs. 239 55