This review discusses the role of computed tomography (CT) in the evaluation of extent of plantar soft tissue infection in the diabetic foot. CT abnormalities are correlated with conventional radiography, results of preoperative aspiration cultures, intraoperative assessment, and bone, gallium, and 111In-leukocyte scan findings. Plantar soft tissue disease respects compartmental boundaries in general, with transcompartmental spread possible along musculotendinous units that normally transgress the intervening fascial septae. CT correlates well with the extent of infection as determined by other modalities, but cannot precisely predict its proximal boundary due to gradual transition between unequivocally abnormal and normal tissue. CT may be useful in establishing an appropriate level for contemplated amputation and can detect extension of superficial diabetic foot infections at an earlier stage than existing clinical methods, potentially resulting in less extensive surgical procedures.
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