Exporting 3ds max 2011 to unity problem!

Hi I have an animation in Max with a guy that has a prosthetic leg. The leg uses a separate rig and when i export it into unity the leg is offset and twitches in some key frames but this is not happing in Max.

UNITY

3DS MAX

Offset when imported

Use bake animation. Turn off keyframe reduction.

Thanks for the reply, it ended up been a problem with the rig of the leg when exporting to fbx. thanks