抄録
From the point of view of the contour line diagram of the thickness of the cartilage, the patella was classified into 3 groups, namely, 1) the thick central type from the center part of the lateral facet to the central ridge, 2) the thick outside type at the outside of the lateral facet and 3) the thick peripheral type at the outside peripheral part of lateral facet. A review was made on the relation of these to the degeneration of cartilage.
The test samples used were 115 patellae of corpses. The degeneration of cartilage was classified into rough surface, velvet formation, defective cartilage and peripheral elevation. The cartilage surface was divided into 7 sections, namely, medial ridge, central ridge, odd facet, medial facet, the two apex sides and the base side of the lateral facet.
All cases showed some degeneration of cartilage. Rough surface was often observed at the medial facet and seldom at the lateral facet. There were numerous observation of velvet formation at the medial ridge and fewer at the odd facet or apex side. Defective cartilage was often seen at the part from the medial facet base to the central ridge. Peripheral elevation was observed frequently at the medial ridge and medial facet apex.
With respect to classification by the thickness of the cartilage, the central type was often observed on rough surfaces, and there were fewer other changes (sites) and no particular features. The outside type showed numerous velvet formations on the base side from the medial facet to the lateral side. Defective cartilage was frequently observed at the medial facet base, and peripheral elevation at the medial facet apex. The peripheral type showed numerous rough facet from the odd facet to the medial ridge. There were many observations of defective cartilage from the medial facet base to the central ridge. Peripheral elevation was often observed at the medial ridge, and there were few velvet formations.
