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Figure 4 | BMC Musculoskeletal Disorders

Figure 4

From: Unexpected angular or rotational deformity after corrective osteotomy

Figure 4

The schematic model of the varization and rotation model. In the varization and rotation model, closed-wedge osteotomy with a proximal cutting plane perpendicular to the axis of the long bone did not lead to unexpected angular deformity after rotation of the proximal fragment (A). The actual rotation at the cutting plane (blue arrow) and rotation force to the proximal fragment (red arrow) occurred in the same direction in this case. Conversely, closed-wedge osteotomy, with a distal cutting plane perpendicular to the axis of the long bone, resulted in unexpected angular deformity after rotation of the proximal fragment. Note that the direction of actual rotation at the cutting plane (blue arrow) differs from that of the rotation force to the proximal fragment (red arrow) (B). α, angle at the hinge point of the closed wedge; β, unexpected angular deformity on the sagittal plane.

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