Question about FDK in hip joint

Main Forum
1

There is a question confused me about the calculation of distance between hip joint center of acetabular cup and femoral head by FDK. A 0.2mm radial clearance was adopted to my THA prosthesis model. It means that if the cup and head contact, there should be at least 0.1mm translation between hip joint center of cup and head. However, I found that the results from Anybody were all lower than 0.1mm. Should I add the radial clearance to the results calculated by the software? :confused:

here is my script to calculate the distance

AnyKinLinear HipHJC={

AnyRefNode &PelvisHJC= Main.HumanModel.BodyModel.Trunk.SegmentsLumbar.PelvisSeg.Left.HipJoint;
AnyRefNode &ThighHJC=Main.HumanModel.BodyModel.Left.Leg.Seg.Thigh.HipJoint.FemImplantNode;
Ref=0;
};

Many thanks for your reply!:smiley:

2

Hello,

It is not really clear what goes wrong. Could you check in the Chart View the distance between surfaces? Could it be that the surfaces are in contact before they are supposed to move - simply locked/allow little motion. What are the translation values? Could it be that you are missing to release the hip joint for FDK to work?

In other words we need a little more detail :slight_smile:

Kind regards,
Pavel