FABER: Flex the hip to 90 degrees, ABduct (move away from the central line), Externally Rotate.
E.g. FABER of the right hip: R. Knee flexion, abduction and external rotation of the R. leg until the R. ankle rests on top of (i.e. is proximal to) the opposite (or contralateral) knee.
FADIR: Flex the hip to 90 degrees, ADduct (move towards and over the central line), Internally Rotate.