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Figure 4. Arthroscopic views of the medial (inside) joint of the knee. A. The femur (F) exhibits the irregularity and wear of moderate arthritis. There is also fraying of the edge of the meniscus (M). The tibial side of the joint (T) has only mild arthritic changes. B. The tibia (T) in the image to the right has severe arthritis, with exposed bone beneath frayed, fragmented articular cartilage. The meniscus (M) is normal in appearance, as is the femur’s articular cartilage (F).
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