Interactive CORA Mapper
Upload Radiograph
Load an image with a clear view of the deformity.
Mapped Parameters
Image Initialization
Load an image to map the Center of Rotation of Angulation (CORA).
Optional: Calibration
Click the Calibrate tool. Click the start and end of a known reference marker if you wish to measure physical translation distances.
Proximal Axis
Click the Proximal Axis tool. Click two points along the center of the medullary canal of the proximal bone segment to establish its anatomical axis.
Distal Axis
Click the Distal Axis tool. Click two points along the center of the medullary canal of the distal bone segment to establish its anatomical axis.
Paley's Osteotomy Rules
With both axes drawn, click Locate CORA in the toolbar to find their exact intersection. Then, visualize the surgical rules below.
When the osteotomy passes exactly through the CORA, the bone segments angulate purely without translation.
When the osteotomy is made outside the CORA (e.g., closer to the metaphysis for healing), the axis of correction must remain at the CORA. This results in expected translation at the osteotomy site.
About CORA Mapping
The Center of Rotation of Angulation (CORA) is the fundamental concept in Dr. Dror Paley's principles of deformity correction.
- Proximal & Distal Axes: Draw the anatomical mid-diaphyseal lines for both segments.
- Intersection: The exact point where these lines cross is the CORA.
- Rule Simulation: Use this tool to visualize how placing your osteotomy (bone cut) at or away from the CORA impacts the physical translation of the bone fragments.