The provided information describes how to locate the center of rotation of angulation (CORA) related to knee deformities, but not specifically a "Cora angle." Instead, the description relates to how to find the CORA, which then helps assess and correct angular deformities. The CORA is found by locating the intersection of specific lines in the leg. Therefore, the question is best rephrased as: How is the Center of Rotation of Angulation (CORA) related to knee alignment determined?
The Center of Rotation of Angulation (CORA) is a crucial point in understanding and correcting angular deformities of the knee. It represents the apex of the deformity. Here's how it's determined, according to the provided information:
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The CORA is the intersection of two lines:
- The mid-diaphyseal line (a line running down the middle of the long bone's shaft).
- A line starting from the middle of the joint and perpendicular to either:
- Abnormal ADTA: (Ankle-Distal Tibial Angle)
- LDTA: (Lateral Distal Tibial Angle)
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The CORA's location can vary:
- Proximally at the tibia.
- At the joint line level.
In essence, finding the CORA is a geometrical exercise that aids surgeons in planning corrective osteotomies (bone cuts) to realign the limb. The angles (like ADTA or LDTA) help define the deformity, and the CORA pinpointing guides where to best perform the correction.
