Hi Tom, ny name is Terry and I went through the same cervical cancer treatment your wife did. I had and still have some of the same problems your wife has with regards to joint pain in my lower back, hips, legs, shoulders and neck. According to my doctors it's a side effect of the radiation. It can take anywhere from a year to a couple of years for it to all go away. (Great thought I know) Their recommendation to me was Advil for the pain, hot tub soaks, aquatic therapy, massages and maybe a chiropractor for an adjustment. I know the implants were very hard on me because of having to remain in one position for three days straight at a time.
Hope this helps and tell your wife she's not alone.
Hugs and prayers...Terry