PMID: 6885875Sep 1, 1983Paper

The effects of indirect blunt trauma on adult canine articular cartilage

The Journal of Bone and Joint Surgery. American Volume
J M DonohueR C Thompson


In order to determine the effect of subfracture loads on articular cartilage, we impacted twelve adult canine patellofemoral joints utilizing a drop-tower with two different force-levels. The joints were examined with light and electron microscopy at two, four, and six weeks after impaction. In ten additional animals a single knee was impacted and they were analyzed biochemically at similar time-periods, using the contralateral joint as a control. In all impacted specimens changes were observed in the zone of calcified cartilage, represented by an increase in cellular clones, vascular invasion, and proteoglycan content of the matrix. Ultrastructural evaluation of the superficial and deep radial zones of the articular cartilage revealed loss of the cellular processes and territorial matrices of chondrocytes in both layers. Ruthenium-red staining of impacted samples revealed a 40 per cent decrease in proteoglycan associated with collagen fibers in the extraterritorial matrix. An increase in collagen-fiber width was observed in the four and six-week groups. The earliest changes in articular cartilage included activation of the zone of calcified cartilage as well as ultrastructural alterations in the superficial and radial zones. B...Continue Reading

Related Concepts

Structure of Articular Cartilage
Canis familiaris
Knee Joint
Proteoglycan Type H
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