Surgical plan solution for deformity correction
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Surgical Plan Solution for Deformity Correction. Seoul National University Movement Research Lab. Seoul National University Bundang Hospital. 2013. 4. 6 Jiwon Jeong. Motivation (1/2). Automatic 3D Reconstruction. Manual Simulation. Automatic Simulation. Lower limb bone (Femur, Tibia)

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Surgical Plan Solution for Deformity Correction

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Surgical plan solution for deformity correction

Surgical Plan Solution for Deformity Correction

Seoul National University Movement Research Lab.

Seoul National University Bundang Hospital

2013. 4. 6

JiwonJeong


Motivation 1 2

Motivation (1/2)

Automatic 3D Reconstruction

ManualSimulation

Automatic Simulation

  • Lower limb bone(Femur, Tibia)

  • 3D mesh model

  • By person

  • Using simulator

  • By simulator

  • Need policy

Personal Data

(X-Ray)

Find Best Solution

  • Variables (position, angle, wedge, etc.)

Perform Surgery

  • Find the best surgical plan and minimization of unexpected side effects

    • Focus on the surgery which cause transformation of bone geometry

    • Care about the complex side effects of single-stage multi-level surgery

Movement Research Lab. SNU


Motivation 2 2

Motivation (2/2)

[Clinical measurements]

[Lower limb alignment]

  • What is an important criterion when developing the surgical plan?

    • Clinical measurements (neck-shaft angle, femoral version, shaft bowing etc.)

    • Lower limb alignment (mechanical axis, anatomical axis, etc.)

Movement Research Lab. SNU


Approach

Approach

  • Full Process

    • 3D reconstruction of lower limb using X-ray images (2 biplanar X-ray images)

    • Find the feature points in lower limb using 3D geometry model

    • Calculate the parameters which are related with lower limb posture

    • Find the best surgical plan (below is an example of FVDO)

      • Input : patient’s current posture (feature points and parameters pair) predefined ideal posture (parameters)

      • Output : wedge angle, cutting position, rotation angle and expected posture

      • Processing : minimization of error between patient’s posture and ideal posture

Movement Research Lab. SNU


Process 1

Process #1

[Process of femur reconstruction]

  • 3D Reconstruction of lower limb using X-ray images

    • Input : 2 biplanar X-ray images

    • Output : 3D geometry model of femur and tibia

    • Development approach

      • Femur : already done (be sure to check it is working accurately to abnormal bone)

      • Tibia : development approach is as same as femur reconstruction

Movement Research Lab. SNU


Process 2 3

Process #2 & #3

[Lower limb feature points & axes example]

[Parameters example]

  • Find the feature points of lower limb using 3D geometry model

    • Using vertex level processing, find the feature points

  • Calculate the parameters which are related with lower limb posture

    • Using the feature points, calculate the axes, planes, and parameters

Movement Research Lab. SNU


Process 4 1 2

Process #4 (1/2)

[FVDO]

  • Find the best surgical plan (in case of FVDO)

    • 3 variables for surgical plan (wedge angle, rotation angle, cutting position)

    • 2 rotation transformation by surgery

    • Minimization of error between patient’s posture and ideal posture

      • variables  transformation matrix  feature points processing : : postoperative feature points set, : preoperative feature points set : Transform matrix by 3 variables

      • If there are ideal feature points set we can find the best values of 3 variables by

      • But, is it possible to find the ideal feature points set?

Movement Research Lab. SNU


Process 4 2 2

Process #4 (2/2)

  • Find the best surgical plan (in case of FVDO)

    • Approach #1 (naïve and discrete)

      • Calculate all the feature points set correspond to whole combination of 3 variables

      • Calculate expected parameters using calculated feature points set

      • Evaluate the expected parameters with normal range or value of that parameters

      • Select the combination of 3 variables that result in minimum difference

    • Approach #2 (continuous)

      • Error minimization between the 2 parameters set (postoperative and ideal)

      • Postoperative parameters should be represented by 3 variables

      • Consider the correlation with parameters and feature points(some feature points are related with multiple parameters)

      • Consider the weight factor for each parameters (the order of priority)

Movement Research Lab. SNU


Action plan

Action Plan

  • Set the feature points and parameters

    • Define important parameters for surgical plan or lower limb posture

    • Define axes, planes, and points for calculation of parameters

  • Formulation

  • Tibia reconstruction

    • Make a training set for tibia reconstruction

    • Check the accuracy of femur reconstruction solution for an abnormal bone

    • Develop a tibia reconstruction

Movement Research Lab. SNU


Crouch posture

Crouch Posture 논문 동영상

  • 주요 스토리라인

Movement Research Lab. SNU


Thank you

Thank you


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