Fig. 1: (A) Sclerotic areas, showing serpentine pattern, in distal femurs extending into articular surfaces and in proximal tibias extending into articular surface on right side. Findings are consistent with bony infarcts. Mild narrowing of medial joint spaces bilaterally, but no articular collapse. (B) Avascular necrosis (arrow) in right lunate (Kienböck's disease), with degenerative changes of radiocarpal joint. Vague opacity in distal aspect of radius likely represents bone infarct. Multiple areas of increased density in several bones of left (C) and right (D) foot (tali, calcanei and navicular bones) and in distal aspect of tibia, consistent with presence of multiple bone infarcts. Technetium-99m radionuclide bone scan showed increased uptake in distal right radius consistent with a healing bone infarct (E). Healed infarct of right lunate (E) and in proximal aspect of right navicular bone (G) were noted. Uptake in lateral femoral condyles (F) was probably due to bone infarcts as well.