DAE export models not preserving mesh volume

schlop3d

So for example I manually rotated my model's knee so that it's bent with correct volume preservation. I then export DAE and include transformations, and when I open the DAE in Maya the knee is squished. Am I missing a step in exporting the pose correctly? 

I usually have no problems exporting poses if they're made through pose control sliders, but I guess because I made the pose manually, I'm now running into this error.