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Fig. 2. —27-year-old man with long-standing pseudoarthrosis, dorsal segmental intercalated instability, synovitis, and advanced degenerative changes in radioscaphoid joint.

C, Coronal fat-suppressed T1-weighted MR image with gadolinium shows complete absence of enhancement in proximal fragment (arrow). Necrosis of proximal fragment was found at surgery. Resection of necrotic bone and wrist arthrodesis was performed. Histopathologic analysis of bone specimen confirmed necrosis.