In cases where an OSCRO fails, a better treatment option may be an oblique double-cut rotation osteotomy (ODCRO). In these cases the procedure may result in a local irregularity where the oblique osteotomy is placed. An OSCRO also fails if a bone deformity extends over a particular length, for example due to trauma or disease 7. However, when rotational deformity is small, a very steep oblique cut is required 4, which is usually not clinically feasible. Subsequent rotation of the distal bone segment about the axis perpendicular to the oblique osteotomy plane yields rotational alignment in the sagittal, coronal and axial planes without bone loss, while maintaining bone contact 4. When rotational deformity (torsion) coexists with angular deformity, correction can be achieved using an oblique single-cut rotation osteotomy (OSCRO), in which the obliquity of the single cut is planned in a specific direction 4, 5, 6. A disadvantage of the closing-wedge osteotomy is the obvious bone shortening. The alternative is using a closing wedge osteotomy where a wedge is removed and the wedge-shaped gap is closed. Several osteotomy types exist such as the opening wedge osteotomy, in which a bone is cut and a segment is tilted to improve alignment, leaving an open wedge, which is either filled 2 or not filled with a bone graft 3. An established treatment option is a corrective osteotomy 1. Awareness of the challenges and possibilities in preoperative planning of an ODCRO will be of value for future alignment surgery and for patients.įracture management may lead to symptomatic malunion of bone segments, requiring surgical treatment. The proposed method renders planning an ODCRO feasible and helps restoring bone alignment and lengthening better than an oblique single-cut rotation osteotomy. In a subset for length reconstruction, the length error of 7.3–21.3 mm was restored to 0.0 mm in 4 of 5 cases, although at the cost of an increased transverse translation. The residual alignment error was smaller for the ODCRO than for the single-cut approach except for one case. The single-cut approach was not feasible in 5 cases, whereas the ODCRO procedure was feasible in all cases. We compare the residual alignment error with an oblique single-cut rotation osteotomy using 15 complex bone deformations. To minimize a residual translation error, we use an optimization algorithm and optimize towards bone length, alignment in the transverse direction, or a balanced reconstruction. We propose virtual preoperative planning of an ODCRO. So far what I've done is duplicated the camera, attached it to the main camera with expressions, renamed it "camera_zdepth" or some such name, and changed the clipping planes on that copied camera.īut it would be great if there was an attribute in the rendernode (or in a furryball camera node?) to override these clipping planes.An oblique double-cut rotation osteotomy (ODCRO) enables correcting a complex bone deformation by aligning, in 3D, the distal, middle and proximal bone segments with a target bone, without intersegmental gaps. But zdepth most likely could be clipped for anything beyond window. Camera far clip would have to be far enough to see the view outside the window.
But we may want the zdepth far clip to be much closer so there is more definition in the z information of the airplane itself.
Camera far clip would have to be very far to capture the sky or very distant landscape. While it makes perfect sense that a furryball zdepth render uses the camera's clipping planes to determine z depth minimum and maximum, often times this can be an issue.įor example, a scene of an airplane in the sky.