The only way I would lift is to hold the back portion of the ex-fix, and probably the foot itself (it may take 2 nurses)
I would never lift by pulling up on the ex-fix - its there for a reason and you dont want to slide something out of place or cause more pain to the patient. (especially when the skin clings to the ex-fix - lifting by it would not be comfortable).
I dont think lifting the limb would displace the fracture, as its already set there by the ex fix rods.
However - all of the ex-fixes i've worked with, (numerous), were for children with limb length discrepency, or femur fractures that were complex. The majority of the time we were breaking the bone, applying the ex fix, and turning the ex-fix knobs to allow for more bone growth.
Just my