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Fig. 1A —10-year-old girl with acute lymphoblastic leukemia. Coronal
T1-weighted unenhanced MR image of knees (A) and diagram (B)
show osteonecrosis as geographic areas of decreased signal. Right knee: A =
Distal femoral diaphysis, not visible on this image. B = Distal femoral
metaphysis, osteonecrotic lesion present. C = Medial distal femoral epiphysis,
osteonecrotic lesion not involving articular surface. D = Lateral distal
femoral epiphysis, osteonecrotic lesion involving 25-50% of articular surface.
E = Medial proximal tibial epiphysis, osteonecrotic lesion involving < 25%
of articular surface. F = Lateral proximal tibial epiphysis, osteonecrotic
lesion involving < 25% of articular surface. G = Proximal tibial
metaphysis, osteonecrotic lesion present. H = Proximal tibial diaphysis,
osteonecrotic lesion present. Left knee: A' = Distal femoral diaphysis,
not visible on this image. B' = Distal femoral metaphysis, osteonecrotic
lesion present. C' = Medial distal femoral epiphysis, osteonecrotic
lesion not involving articular surface. D' = Lateral distal femoral
epiphysis, osteonecrotic lesion involving 25-50% of articular surface.
E' = Medial proximal tibial epiphysis, osteonecrotic lesion not
involving articular surface. F' = Lateral proximal tibial epiphysis,
osteonecrotic lesion not involving articular surface. G' = Proximal
tibial metaphysis, osteonecrotic lesion present. H' = Proximal tibial
diaphysis, osteonecrotic lesion present.
