Développement du cartilage articulaire équin du fœtus à l’adulte : imagerie par résonance magnétique et microscopie en lumière polarisée
Adult articular cartilage has a zonal or layered structure, created by the predominant collagen fibre orientation (Benninghoff, 1925). Before reaching the classical “Benninghoff structure”, major changes take place with maturation from juvenile to adult cartilage (Julkunen et al., 2010; Lecocq et al., 2008). However, there have been few studies addressing the in utero collagen structure of articular cartilage. Our objective was to study the maturation of the distal femoral epiphysis articular surface, employing both magnetic resonance imaging and polarized light microscopy with picrosirius red staining, at sites employed for cartilage repair studies or susceptible to osteochondrosis to describe normal development of the spatial architecture of the collagen network at these sites and the relationship between magnetic resonance images and histology. Samples were harvested from five sites from the distal femoral epiphysis of 14 fetuses and 10 foals and adults, after the stifle was imaged with magnetic resonance imaging. Sections were stained with picrosirius red to determine the structural arrangement of the type II collagen fibres. Both magnetic resonance imaging and polarized light microscopy revealed an early progressive structural laminar/zonal organization of the collagen network, prior to birth and postnatal load-bearing.
Horse Foetus Fetus Histology Magnetic resonance imaging Articular cartilage Collagen Osteochondrosis