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In Vitro MR Imaging of Hyaline Cartilage

Correlation with Scanning Electron Microscopy

¹ All authors: Department of Radiology, Dartmouth Medical School, Dartmouth Hitchcock Medical Center, One Medical Center Dr., Lebanon, NH 03756.

View larger version (24K): [in a new window]   Fig. 1. — Drawing of collagen architecture shows leaves or layers consisting of mesh of collagen fibrils that curve into plane of articular surface. (Reprinted with permission from [4])

View larger version (70K): [in a new window]   Fig. 2A. —55-year-old woman after above-knee amputation resulting from acute vascular occlusion of lower extremity. MR image of hyaline cartilage from femoral condyle imaged with surface perpendicular to the main magnetic field (B0, black arrow) shows surface (1), transitional (2), and deep (3) layers. Note thin high-signal-intensity layer (two white arrows) at border with subchondral bone. Also note score (arrowhead) cut in bone later used to fracture sample. Area displayed with electron microscopy in C is also marked (single white arrow).

View larger version (90K): [in a new window]   Fig. 3A. —55-year-old man after above-knee amputation for chronic vascular disease. MR image obtained with surface perpendicular to main magnetic field (B0, black arrow) shows three-layer appearance. High-signal-intensity transitional layer (white arrow) is present. Because surface is curved, influence of orientation is apparent. Increased signal intensity in deep layer and decreased signal intensity in superficial regions of transitional layer of cartilage are evident where sample is not perpendicular to B0.

View larger version (83K): [in a new window]   Fig. 3B. —55-year-old man after above-knee amputation for chronic vascular disease. MR image obtained with surface parallel to B0 (black arrow) shows increased signal intensity in deep layer, while decreasing signal intensity in superficial portion of transitional layer causes increase in thickness of surface layer. At this orientation, portions of transitional layer (white arrow) have low signal intensity.

View larger version (158K): [in a new window]   Fig. 2B. —55-year-old woman after above-knee amputation resulting from acute vascular occlusion of lower extremity. Scanning electron microscopy image reveals curvature of fracture plane (arrows).

View larger version (211K): [in a new window]   Fig. 2C. —55-year-old woman after above-knee amputation resulting from acute vascular occlusion of lower extremity. High-power scanning electron microscopy image from region of deep MR layer shows that individual collagen fibrils are not radially oriented.

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