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What does the magnitude of the CORA equates ?
the degree of correction required to eliminate the deformity
What is the transverse bisecting line ?
straight line that bisects the mediolateral pair and runs through the CORA
Where are positioned the motor of an external skeletal fixator?
- on the side opposite the hinge axis
- along CORA plane
If the planes of 2 deformities within a bone are in the same direction, magnifying the angulation, how is the directional relationship between the CORAs called?
Noncompensated
Compared to the deviation of the bone, in which direction is the CORA?
Always in the direction opposite to how the bone is deviated
What is the neutral CORA?
The point of intersection of the axes of 2 segments of the bone that are angled relative to one another
What are the disadvantages of bone plate and screws?
- Alignment adjustments not possible postoperatively
- Contouring of the plate challenging
- More extensive approaches and exposure of the bone
- ↑ initial patient morbidity
- Difficult in multiapical deformities with severe degrees of soft tissue contracture that cannot be stretched acutely
- Difficult in juxta-articular deformities
How is the plane of the hinge axis or angulation correction axis in relationship to the CORA?
Perpendicular relationship to the plane of the CORA
What is the limitation of dome osteotomie? What is the consequences?
- Bone that are nonuniform in cross-section => ex: canine radius = ovoid
- Dome osteotomy blade must be size-matched with the bone in the widest dimension
=> size mismatching in the sagittal plane + large decreases in post-correctional apposition and correctional accuracy
Which osteotomie technique is more adapted for bone plate and screws? and for external fixator?
- bone plate and screws
=> Closing wedge ostectomy
- external skeletal fixator
=>Opening wedge osteotomies with little or no bone apposition possible
What are the advantages of bone plate and screws?
- Immediate rigid fixation => early return to function
- Less intensive postoperative care
What is an opening CORA?
the point along the transverse bisecting line on the convex side of the neutral CORA
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