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Figure 2a: MR images show joint erosion. (a) Sagittal fast spin-echo IR image (5100/45/150) of the midfoot of a 52-year-old man with neuropathic arthropathy of the Lisfranc joint shows mild subchondral edema (arrowhead) but preservation of the articular surfaces. (b) Follow-up sagittal T1-weighted fat-suppressed postcontrast fast multiplanar spoiled GRE MR image (333/2) obtained in the same patient 16 months later shows erosion of the joint margin (arrowhead). Superimposed osteomyelitis was documented at biopsy of the first metatarsal base and cuneiform. Note also discrete marrow enhancement, extending 2.0 cm from the metatarsal articular surface (long arrow) and diffusely involving the cuneiform (short arrow).
