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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 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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  1. Surgical Plan Solution for Deformity Correction Seoul National University Movement Research Lab. Seoul National University Bundang Hospital 2013. 4. 6 JiwonJeong

  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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. Crouch Posture 논문 동영상 • 주요 스토리라인 Movement Research Lab. SNU

  11. Thank you

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