# Cylinder fit in the superior facies of the trochlea tali for local coordinate system

**URL:** <https://discourse.slicer.org/t/cylinder-fit-in-the-superior-facies-of-the-trochlea-tali-for-local-coordinate-system/27147>\
**Category:** Support\
**Created:** [January 9, 2023, 10:49pm UTC](https://discourse.slicer.org/t/cylinder-fit-in-the-superior-facies-of-the-trochlea-tali-for-local-coordinate-system/27147 "2023-01-09T22:49:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Daan1](https://avatars.discourse-cdn.com/v4/letter/d/c2a13f/32.png) [@Daan1](https://discourse.slicer.org/u/Daan1)\
**Post date:** [January 9, 2023, 10:49pm UTC](https://discourse.slicer.org/t/cylinder-fit-in-the-superior-facies-of-the-trochlea-tali-for-local-coordinate-system/27147/1 "2023-01-09T22:49:58Z")

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I want to fit a cylinder in the superior facies of the trochlea tali of the talus, to finally arrive at a local coordinate system. Is there a direct way for this? I can find how to do this with a sphere, but not with a cylinder.  
This can be done in mimics, but I would like to do this in 3d slicer

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/5/c5a813f4005e3842f7b618c005cf132a7cc80081.png)