Lower Body Segment orientations from Plug-in Gait

[Moh Jor Ehmid]

Hi All,
I was wondering whether anyone else has successfully exported the segment orientations from the Lower Body Plug-in Gait using Vicon Nexus 1.8? I am stuck in here to understand whether these orientations are being calculated in Vicon Nexus? Any support would be much appreciated

[Wagner De Godoy]

Re: Lower Body Segment orientations from Plug-in Gait

Dear Mr. Moh Ehmid.
The origins and axes of each segment are shown in Nexus after processing, however, to export this information the axes are not stored as vectors, but as additional markers in origin and on the x, y, and z local axes for each segment: pelvis, thigh, tibia, and foot. These additional markers can be viewed in Vicon BodyBuilder software. The coordinates of the 4 reference markers (origin, x, y and z) can be exported on the Nexus by the command in the upper right button: Pipeline>Workstation Operations>Export data to ASCII file (advanced). In 'Options' button select the mkr file (PlugInGait_LBS.mkr) that is attached to this email (this file can be read in MS Notepad). It may be useful to export all markers for later analysis. In the 'Options select only Trajectories. A CSV file will be exported to the original data folder of C3D file. The unit vectors can be determined by the 4 reference points of each segment for later calculations. I apologize for the translation failures.
Best Regards.
Wagner de Godoy

Note:Change the file from .txt to .mkr

[Richard Baker]

Re: Lower Body Segment orientations from Plug-in Gait

I've got software on my blog-site to calculate what I call projection angles which are the angles made by lower limb body segments when projected onto one of the principal global planes (so the femur projections are the angles that the line from knee joint centre to hip joint centre makes with the vertical when projected on to the global sagittal and coronal planes). The software is written in BodyLanguage and should be reasonably easy to amend if you want different outputs. Click here for a direct link to the relevant page from where you can download the software.

Richard

[Moh Jor Ehmid]

Re: Lower Body Segment orientations from Plug-in Gait

Thanks for all your help. Both of you are stars!