Hi...
This is the only thing I can think of,
when a woman has a hysterectomy some nerves are either cut or damaged during the op. Maybe the nerves in your wife's legs are being affected by this???
Or worse case ,is there any redness or burning sensation in the pain area??? Does it feel hot to the touch and is it swollen.
Read up on blood clots ok
hope this helps keep me informed.
Take care