• FEA of PLLA Interference Screws

    by
    Jorgen
    Published on 2011-08-22 13:55
    4 Comments Comments
    I gave a presentation on advanced FE modeling of PLLA intereference screws at the ANSYS User's conference in Boston on Sep 14, 2011. In my presentation I discussed how the design of degradable screws can be optimized for use in Anterior cruciate ligament (ACL) reconstruction surgery. PLLA is a non-linear viscoplastic material that can be accurately modeled using the PolyUMod library.
    Comments 4 Comments
    1. lumpwood's Avatar
      lumpwood - 2011-09-01, 02:58
      Sounds interesting...are you also considering the effects of bio-degradation on the long-term mechanical behavior of the implant or is your focus mainly on its short term behavior?
    1. Jorgen's Avatar
      Jorgen - 2011-09-03, 05:01
      We are currently focusing on the short-term response, but the next step in this project will be to include direct considerations of the bio-degradation and how that influences the mechanical response. We are currently working on developing a suitable experimental procedure.

      -Jorgen
    1. IceBreaker's Avatar
      IceBreaker - 2012-05-22, 12:42
      Hi Dr. Jorgen,

      I find this very interesting. If it is possible, could you please upload the presentation? I wonder what type of loads were applied and how the bone/cartilage was modeled.
    1. Jorgen's Avatar
      Jorgen - 2012-05-27, 19:37
      Hi IceBreaker,

      Here is the presentation.

      Note that it is rather simple study that can be improved in many ways. I ran the simulations using both ANSYS and Abaqus, but the attached presentation is only showing the Abaqus results.

      -Jorgen