The subchondral bone plate is composed of two layers that separate articular cartilage from the marrow-containing cancellous bone. The superficial layer consists of calcified cartilage, which is separated by the cement line (tidemark) from the deep layer of compact cortical bone 1-3.
Subchondral bone plate appears as one structure on MRI in routine clinical use, i.e. the calcified cartilage layer cannot be separate from subchondral bone 1.
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