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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

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

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