Zur Dicke des Gelenkknorpels an der Trochlea tali proximalis und der Cochlea tibiae beim großwüchsigen Hund

Osteochondrosis dissecans (OCD) is a well known disease in dogs that usually affects convex joint surfaces of largebreed, fastgrowing dogs aged four to seven months. Nine percent of the canine CCD-cases affect the hock joint, more precisely the trochlea tali proximalis (Montgomery et al., 1994). OCD is regarded as a result of a disturbed enchondral ossification. The cartilage thickness of the trochlea tali proximalis and the cochlea tibiae was measured in ten adult largebreed dogs. The measurement was done photooptically. In each joint the cartilage thickness was determined on eleven points at the trochlea tali proximalis and two points at the cochlea tibiae. At the trochlea tali proximalis it decreased from proximal to dorsal. Almost no difference in cartilage thickness was recorded between dorsal und distal. Regarding the proximal measuring points the cartilage was statistically significantly thicker at the lateral ridge than at the medial ridge. In contrast the cartilage thickness was almost equal at the two ridges proximodorsal, dorsal and distal. At the cochlea tibiae the thickness at the two measuring points was similar Usually the cartilage was statistically significantly thicker in male than in female adult largebreed dogs

Cartilage thickness of the trochlea of the talus, with emphasis on sites predisposed to osteochondrosis dissecans, in clinically normal juvenile and adult dogs

Objective-To evaluate cartilage thickness of the talus (especially at sites predisposed to osteochondrosis dissecans [OCD]) in growing and adult dogs not affected with OCD. Sample-Tarsocrural joints from cadavers of 34 juvenile (approx 3 months old) and 10 adult dogs. Procedures-Tarsal cartilage thickness was examined via a stereophotography microscopic system. Articular cartilage thickness was determined at 11 locations on longitudinal slices of the trochlear ridges and the sulcus between the ridges and at 2 locations in the cochlea tibiae. Cartilage thickness was measured at the proximal, proximodorsal, dorsal, and distal aspects of the trochlear ridges; proximodorsal, dorsal, and distal aspects of the trochlear sulcus; and craniolateral and caudomedial aspects of the cochlea tibiae. Differences within a joint and between sexes were evaluated. Results-Mean cartilage thickness decreased from proximal to distal in juvenile (lateral trochlear ridge, 1.52 to 0.41 mm; medial trochlear ridge, 1.10 to 0.40 mm) and from proximal to dorsal in adult (lateral trochlear ridge, 0.41 to 0.34 mm; medial trochlear ridge, 0.33 to 0.23 mm) dogs. Cartilage was thickest at the proximal aspect of the lateral trochlear ridge in both groups. Differences in proximodorsal, dorsal, and distal aspects of the ridges were not evident. Conclusions and Clinical Relevance-Healthy tarsocrural joints did not have thicker cartilage in sites predisposed to development of OCD. Evaluation of affected tarsocrural joints is necessary to exclude influences of cartilage thickness. These data are useful as a reference for distribution of cartilage thickness of the trochlea of the talus in dogs