Centre of Rotation Angulation CORA ; fundamental concept in orthopedic deformity correction

Описание: Centre of Rotation of Angulation (CORA) is a fundamental concept in orthopedic deformity correction, especially when planning osteotomies to realign bones.

🔍 What is CORA?
CORA is the point where the proximal and distal anatomical axes of a deformed bone intersect.

It represents the apex of angular deformity and serves as the ideal pivot point for correction.

Correcting a deformity at the CORA allows for pure angular correction without introducing unwanted translation (sideways shift).

🛠️ Why is CORA Important?
It helps surgeons determine the type and location of osteotomy (bone cut) needed.

Ensures mechanical axis realignment of the limb, improving function and reducing joint stress.

Prevents iatrogenic deformities (those caused by incorrect surgical technique).

🧭 Types of Osteotomies Based on CORA
Osteotomy Type CORA Location Effect on Bone Length Translation Risk
Opening Wedge At convex cortex Increases Minimal
Closing Wedge At concave cortex Decreases Minimal
Neutral Wedge At bone center No change Minimal
Dome Osteotomy Offset from CORA Variable Translation likely
🧠 Key Concepts
Bisector Line: A line through the CORA that bisects the angle between the two axes—used as the axis of correction.

Multi-apical Deformity: If more than one CORA exists, the deformity is complex and may require staged or combined corrections.

Mechanical vs. Anatomical Axis: Mechanical axis connects joint centers; anatomical axis follows the bone shaft.

#Angulation