Case Report

The Relationship between Osteoporosis and Osteoarthritis of the Knee: A Report of 2 Cases with Suspected Osteonecrosis

Figure 4

Photomicrographs of the femoral condyle obtained from the surgical site in Case 1. A specimen obtained from the central area of the lesion shows less destructive joint cartilage, healing of the subchondral bone, and migration of the fibrous tissue into the subchondral area (a). A specimen from the surrounding area of the lesion shows normal joint cartilage, thinning of trabecular bone, and lesser trabecular connectivity, suggesting osteoporosis of the subchondral area (b). Hematoxylin and eosin stain. Original magnification ×40.
514058.fig.004a
(a)
514058.fig.004b
(b)