Figure 2. Magnetic resonance imaging scans of three patients with unilateral lesions of osteonecrosis (arrows).

Shown are high-resolution T1-weighted images (left) and corresponding fat-suppressed T2-weighted images (right). A. Coronal view of a wedge-shaped lesion of the anteromedial femoral head. B. Saggital view of a small subchondral lesion of the anterior superior aspect of the femoral head. C. Axial view of a large curvilinear lesion of the femoral head.