Oblique Plane Deformities

Angular deformity may occur in any plane. The standard reference planes are the two anatomic planes: coronal (frontal) and sagittal. The standard reference radio-graphs that correspond to these planes are the AP and LAT radiographs, respectively. Uniapical angular deformities for which angulation is seen on both AP and LAT radiographs are often incorrectly referred to as biplanar angular deformities. These biplanar angular deformities are actually uniplanar angular deformities in an oblique plane (between the frontal and sagittal planes) ( Fig.7-1).