Performing the osteotomy
Intraoperatively osteotomy planes a and c will be performed sequentially followed by osteotomy plane b to connect the first two components of the osteotomy.
Osteotomy planes a and c are both sawn from the surface of the bone 50% of the distance from medial or lateral to the mid-portion of the bone.
Osteotomy plane a is created parallel to the proximal joint surface, osteotomy plane b is created parallel to the distal joint surface of McIII/MtIII.
Once these cuts are completed, osteotomy plane b is sawn in the sagittal plane using two osteotomy planes, one perpendicular to osteotomy plane a (x) and one perpendicular to osteotomy plane c (y).