Mycobacterium tuberculosis infection of a presumed Charcot joint.

A 65-year-old male with peripheral neuropathy and small lymphocytic lymphoma presented with erythema and edema of the left foot. A Charcot midfoot was diagnosed and treated with a total contact cast and restricted weight bearing. However, subsequent analysis of bone and synovial fluid months later revealed Mycobacterium tuberculosis infection.

Variations in mortise anatomy.

Background: Variations in ankle mortise anatomy may be a predisposing factor to ankle instability.

Hypothesis: A posteriorly positioned fibula associated with ankle instability may not be a true pathologic entity but rather the result of measuring off an internally rotated talus.

Study Design: Cohort study (diagnosis); Level of evidence, 2.