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Fig. 6. —Drawing shows architecture of extracellular matrix of tibial
plateau. Viewed from above (a), split lines in peripheral region of plateau
are arranged in wheel-spoke pattern. After fracture sectioning in coronal
plane, surface of anterior half is viewed en face (b) and then viewed
at oblique orientation (c). In central portion of tibial plateau (1),
cartilage has columnlike structure that is perpendicular to underlying
subchondral bone and curves at superficial level (2). At tibial eminence (3),
cartilage maintains columnlike structure, but instead of perpendicular
alignment relative to subchondral bone, its alignment approaches
weight-bearing axis of joint. At submeniscal region of joint (4), tissue
curves both away from center of joint and in annular direction perpendicular
to orientation of split lines in articular surface (5).
