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Fig. 4A. —Focal variations in glycosaminoglycan distribution
(T1Gd) images. Axial T1Gd image obtained in 63-year-old
woman with osteoarthritis (diagnosed on basis of radiographic findings of
osteophyte and clinical knee symptoms) and evidence of medial patellar
subluxation and medial patellofemoral narrowing. Patella shows lateral lesion
(red area) with mean index (mean ± SD, 289 ± 47 msec)
30% lower than that of adjacent tissue (423 ± 96 msec). Low
T1Gd levels may be precursor to frank cartilage loss such as that
seen in medial patella.
