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Definition of displaced or unstable*

NB N. A. C. van den Boom
GS G. A. N. L. Stollenwerck
SE S. M. A. A. Evers
MP M. Poeze
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Instability, e.g., displacement or malalignment on radiographs interpreted as follows:

AP view:

Lateral displacement of 2nd metatarsal on intermediate cuneiform, medial margin of the second metatarsal and the middle cuneiform not aligned. TMT 1 disruption, lateral margin of the first metatarsal not aligned with the lateral margin of the medial cuneiform; Gap between 1st and 2nd metatarsal and/or ceuneiforme medialis and intermedius (> 2 mm);

30-degree oblique view:

Lateral displacement of 3rd metatarsal on lateral cuneiform, lateral margin of the third metatarsal and the lateral cuneiform not aligned; Medial margin of the fourth metatarsal and cuboid not aligned;

Lateral view:

Dorsal displacement of the metatarsal bases above the level of the cuneiforms.

Any view:

Bony avulsion fractures between base 2nd metatarsal and cuneiforme medialis (fleck sign), and/or between cuneiforme medialis and intermedius.

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