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Comment: Minor edits


  • Before starting the simulated surgery, make sure you can see both muscles from the transfer muscle group. Then, zoom in on the wrist joint. Click on the insertion muscle point of ECU_pre-surgery
    Note: Once selected, a yellow box will appear around the muscle point. Its name (ECU_pre-surgery-P7) should be displayed at the bottom-left of the GUI
  • To move the selected muscle point, use the red, blue, and green arrows that appear on muscle selection to adjust the muscle point's location along a single axis.


  • Open a new plot from the Tools menu. Click the Properties button and type Wrist Flexion Moment vs. Flexion Angle into the textbox Textbox under the Title tab. Click OK. Click the Y-Quantity button, and select moment > flexion.
    Note: Do not select elbow_flexion! 

  • Filter the muscle list by model and extensors group. Select all of the muscles in the extensors group by checking the select all shown checkbox. De-select the ECU_post-surgery muscle by "un-checking" the ECU_post-surgery checkbox. To plot the sum of all the moments, check the sum only checkbox.

  • Click the X-Quantity button and select flexion.

  • Edit the Curve Name text to read Before Surgery.

  • Then click Add.


  • Edit the tendon_slack_length text box to read 0.2105 in the Properties Window.. 
  • To add new curves for the edited ECRB muscle, click Add in each plotter window.
    Note: It may be helpful to edit each Curves Name to read "ECRB lts = 0.2105 m" before adding the curves.


Feel free to change the tendon slack length and make more curves to further demonstrate the effects you have seen. For additional information, refer to the references below.


Wendy Murray and Scott Delp with help from many others.


1. Gonzalez, R.V., Buchanan, T.S., Delp, S.L. How muscle architecture and moment arms affect wrist flexion-extension moments. Journal of Biomechanics, vol. 30, pp. 705-712, 1997.