NURBS organic contact areas

From a NURBS model of two rodent bones, I would like to create an assembly in order to study the range of motion in a joint. I would like to define the contact area out of the NURBS faces and then mate the two contacting joint faces.

Is there a way to do this in Solidworks?

Please see the attached image for sample part. The joint surface for mating is marked in pink.

SolidworksParts And Features