This may not help...I didn't have much hip pain at all from my ACDF in the hip area until a month or so later.....then it was very sore at times sleeping. Then, all that went away.,a year later a little tenderness but nothing compared to what some people experience like yourself.....Can you try a glucosamine ointment from the health food store...I rubbed vit E oil from capsule on my neck and hip incision and the scarring and tenderness are minimal. People ask me to point out the surgery and my gp (mind you she is not the most attentive) asked me upon my yearly check up what the mark was on my neck.
I hope you give some rubs a try..whats useless to one can be immensely beneficial to the other.
Good luck..the only other thing I can think of in the hip area is a general tightness you get from the muscles guarding when you have a low back issue like l5 s1. I had that problem too and had a microdiskectomy six months after neck surgery..common are lumbar problems to precede neck as the low back weakens and taxes out the neck usage and next thing you know you have neck problems too. Don't despair.,,try try again..
Nearly new...eventually ...Nero