Optimize implant positioning

The implant position can be optimized to obtain specific joint kinematics or kinetics, while accounting for muscle and ligament forces. This can be done using the methods described in LINK TO “Implant behavior inside body - motion, forces, stability”

Optimization can be done using built-in gradient-based optimization solvers or from external optimizers by accessing AnyBody through the command line application of AnyBody.

Examples:

  • Restore natural knee kinematics
  • Mechanical and kinematic alignments in total knee arthroplasty
  • Joint stability following arthroplasty
  • Patellar tracking
  • Knee stability
  • Soft tissue balancing

Examples of input and output for an implant positioning model:

Input:

  • Implants CAD files (STL)
  • Implant positioning data
  • Bone CAD files (STL)
  • Anthropometrics data
  • Motion data and ground reaction force
  • Definition of objective for optimization (e.g. minimize joint reaction forces)

Output:

  • Optimal implant position
  • Implant secondary DOF motion
  • Implant contact forces (accounting for muscles)
  • Muscle and ligament forces
  • And much more

Contact usto learn more or to discuss how we could solve your problem

  1. Reproduce the activity, e.g. walking, using your own data or an existing AnyBody model
  2. Create a force-dependent model of the joint in question see LINK TO “Implant behavior inside body - motion, forces, stability”
  3. Create design variables in the model, which can alter the implant position
  4. Create an objective function based on biomechanical properties in the model such as joint motion, joint forces, and ligament forces.
  5. Create the optimization study incorporating the design variables that control implant positions and the biomechanically based objective function
  1. 2019, Dejtiar DL, Dzialo CM, Pedersen PH, Jensen KK, Fleron M, Andersen MS (2019), "Development and evaluation of a subject-specific lower limb model with an 11 DOF natural knee model using MRI and EOS during a quasi-static lunge", J. Biomech. Eng.. [DOI]