What does the strain value of the ligament represent at Knee simulator

When checking the physical properties of strain in anybody demo file called knee simulator, it is largely divided into Stiffness and Reference strain.
Here, you can confirm that the sinffness is force using the unit of N, but about the strain, it is written only as a reference strain and there is no other unit, so I am not sure what it represents.
I hope there is someone who can give me an answer on this.
Or, please reply to Seong9568@naver.com

Hi @Seong

There is a published paper regarding the knee simulator model and you can find it here:

In the FDK section you can read what the reference strain is and how the equations are set up.

Best regards,

Thank you @Bjorn

The information you provided has been very helpful.

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