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Deformity correction

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Dalia El Said
Dalia El Said

This document discusses methods for measuring alignment in the lower limbs, including the knee and hip joints. It outlines several key anatomical lines used as references, such as the mechanical axis of the femur and tibia. Joint orientation lines and angles are important for assessing malalignment. Measuring these lines and angles helps evaluate deformities and plan corrective procedures like osteotomies, which are performed at the center of rotation angle.

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Deformity correction
Line between the center of the femoral head and the center of the knee joint (between both femoral condyles).
A mid diaphyseal line passing along the length of the intramedullary canal.
- It extends between center of the femoral head and the center of the tibial plafond.
Deformity correction
- Lines represent the orientation of the joint in certain plane. - Knee Joint - Along the subchondral line of the tibial plateau. - Line tangential to the most distal point of the femoral condyles.
Normally joint lines are parallel within 2 degrees. Angles greater than 2 degrees are considered as a source of mechanical axis deviation (MAD).
-Angle between: -Line along the mechanical axis of the femur and line along the distal point of the femoral condyles - Normal range is 85- 90 degrees.
-Angle between: -Line along the mechanical axis of the tibia and line along the tibial plateau. - Normal range is 85- 90 degrees.
Deformity correction
In cases of deformity:- - Angle between the distal tibial mechanical axis and line along the tibial plafond. - If one side is normal then it is used as a template for the deformed site. - If both are deformed then consider normal angles.
- (Center of rotation angle). - Point at which proximal and distal axis lines intersect. - Osteotomy fracture is done at CORA site.
Deformity correction
1- Measure mechanical axes of both lower limbs. 2- Joint orientation lines. 3- LPFA and MPTA/LDTA. 4- CORA.
Deformity correction
THANK YOU

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Deformity correction

  • 2. Line between the center of the femoral head and the center of the knee joint (between both femoral condyles).
  • 3. A mid diaphyseal line passing along the length of the intramedullary canal.
  • 4. - It extends between center of the femoral head and the center of the tibial plafond.
  • 6. - Lines represent the orientation of the joint in certain plane. - Knee Joint - Along the subchondral line of the tibial plateau. - Line tangential to the most distal point of the femoral condyles.
  • 7. Normally joint lines are parallel within 2 degrees. Angles greater than 2 degrees are considered as a source of mechanical axis deviation (MAD).
  • 8. -Angle between: -Line along the mechanical axis of the femur and line along the distal point of the femoral condyles - Normal range is 85- 90 degrees.
  • 9. -Angle between: -Line along the mechanical axis of the tibia and line along the tibial plateau. - Normal range is 85- 90 degrees.
  • 11. In cases of deformity:- - Angle between the distal tibial mechanical axis and line along the tibial plafond. - If one side is normal then it is used as a template for the deformed site. - If both are deformed then consider normal angles.
  • 12. - (Center of rotation angle). - Point at which proximal and distal axis lines intersect. - Osteotomy fracture is done at CORA site.
  • 14. 1- Measure mechanical axes of both lower limbs. 2- Joint orientation lines. 3- LPFA and MPTA/LDTA. 4- CORA.