In the following screenshot I have the elbow of a rigged human model in 3d studio max, as you can see it looks natural: http://i.imgur.com/CFozg.png
Here it is in Unity: http://i.imgur.com/ltGib.png
The rig is biped and has a physique modifier attached in max, I'm not sure what steps to take to fix it...
Why is this and how can I fix it?