# seperating a femur from the plevis

**URL:** <https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891>\
**Category:** Support\
**Created:** [January 22, 2018, 12:19am UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891 "2018-01-22T00:19:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![MSilent](https://avatars.discourse-cdn.com/v4/letter/m/eb8c5e/32.png) [@MSilent](https://discourse.slicer.org/u/MSilent)\
**Post date:** [January 22, 2018, 12:19am UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891/1 "2018-01-22T00:19:54Z")

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Operating system: Windos  
Slicer version:latest  
Expected behavior: segmentation of 2 bones  
Actual behavior: segmentation colour crosses to both bones

I am trying to 3d print a pelvis and a femur from a CT. They have to be separate for the print so they will articulate for presurgical planning. When I cut it down to size it works perfectly. However when I try to use the editor to colour the femur and the pelvis two different colours the colour bleeds through to the other bone. Until I can use separate colours for the two bones I will not be able to remove one and print it and then remove the first and print the second.

Thanks for any help.

MSilent

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [January 22, 2018, 1:24pm UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891/2 "2018-01-22T13:24:47Z")

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Probably your best option is to manually separate the two parts. Using a sphere brush to paint the femoral head may be the easiest. The Segment Editor with the scissors in 3D could also be very helpful.

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**Author:** ![MRI23D](https://avatars.discourse-cdn.com/v4/letter/m/edb3f5/32.png) [@MRI23D](https://discourse.slicer.org/u/MRI23D)\
**Post date:** [January 22, 2018, 1:41pm UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891/3 "2018-01-22T13:41:59Z")

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Two MRI coordinations arent the same either. Patient head was slanted.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [January 22, 2018, 4:57pm UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891/4 "2018-01-22T16:57:03Z")

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I’ve tried semi-automatic method in the past, but due to pelvis and femur head have the same intensity in the image and they appear to be touching each other (unless image has very high resolution), they did not work well. So, Steve’s suggestion of using sphere brush will most likely the easiest method.

This has come up a few times, so I’ve recorded a video that shows the exact steps that you can follow:

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**Author:** ![MSilent](https://avatars.discourse-cdn.com/v4/letter/m/eb8c5e/32.png) [@MSilent](https://discourse.slicer.org/u/MSilent)\
**Post date:** [January 25, 2018, 8:00pm UTC](https://discourse.slicer.org/t/seperating-a-femur-from-the-plevis/1891/5 "2018-01-25T20:00:22Z")

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I watched your video but was busy and now I am working on the hip today.  
The video is no longer up. Can you repost it so I can go step by step?

Thank you,  
Pat