i dont know what harrington rods are,
i am guessing, if that is the name u have used for #femar rods, they can be removed if so wished, but the ususally they are left there if there are no complaints.
or are theses rods used in spinal stabilisation?, if that is so, i am sory i don't know, but i will be greatful, if you let me know the right answer as well if u find out. Thanks