Rigg: solutions for angular knees that are easy to animate?

Hello everyone !
I have a character to rig who has angular joints and I would like to keep the autopatches. Do you have an idea of ​​an effective and fast solution to animate and which preserves the angle of the knees articulation? I mean I’d like to preserve autopatch, but still have angular joints

May be a cutter system ?

Thank you all a lot :slight_smile: