Relationship between the lesions of the patellar cartilage and the hardness of the subchondral bone using CT for evaluation.

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CT can evaluate the hardness of the subchondral bone, because its hardness is associated with the thickness of the bone plate and trabeculae. 47 patients with patello-femoral arthralgia were examined by CT, arthroscopy and/or arthorotomy. They were divided into normal and abnormal cartilage groups, and the latter was subdivided into 3 groups. The measured sites of the hardness of the subchondral bone using CT were the center of the lateral facet. the median ridge and the center of the medial facet. The shape of the subchondral bone was classified into 5 types. The hardness was lowest in the medial facet in the abnormal group, and stiffness gradient existed between the median ridge and medial facet in the abnormal group. The shape of the subchondral bone was relatively high at the center of the lateral facet, and thin and irregular in the abnormal. group. The hardness between the lateral facet and the median ridge, in which most of the lesions of the cartilage existed in our cases, was not significantly different. The stiffness gradient and shape of the subchondral bone could be related with the lesions of the patellar cartilage, or vice versa.
西日本整形・災害外科学会の論文