Fusing one joint sounds simple until the forces are counted: even a small articulation of the midfoot sees bending loads with every step, and a fusion site that moves does not unite. A dedicated single-joint plate therefore concentrates on rigidity within a small footprint, holding the prepared surfaces in tight apposition while bone bridges the gap.
The two geometries approach rigidity differently. The X-type plate works actively: its crossed arms and compression holes draw the joint together as the screws are driven, so the plate itself generates part of the compression. The ring-type plate works passively: its closed loop frames the fusion site and blocks bending from any direction once the surfaces have been compressed. The choice between them follows the joint, the approach and the preference of the operating surgeon.