Oh how I relate to your post, ouchhhh.
I was advanced bone on bone, and local GP did not refer me in a timely manner to the surgeon, when he finally saw me, said this is urgent and booked me for surgery 10 days later, in a public hospital in australia, normal time time for hips can be six to seven months after you see surgeon, it was with my second hip replacement as it was not so advanced bone on bone.
I was helped into the front door of hospital, the morning of my surgery and seated in a wheelchair, from there straight to surgery unit.
Woke up the next day in less pain than I had been in the last couple of years, and nurses telling me I hadn't used my self-admistered pain relief button, I didn't need it, but when i tried to move, Oh not pretty, but the pain was completely different, muscles in legs felt as though they had just done a marathon, stiff and sore feeling and cut on side of hip was sore but not too bad, Oh can tell you I used that pain relief button then.
Physios got me out of bed with help, and walked me to the door of hospital room, I felt so good, I walked half way down the corridor to nurses station, the following day walked to the day room, 60 bed ward, 30 meters or more.
I continued to add a few extra steps each and every day from there on, never been better, best thing I could have done, walking to the corner store by week 12 post hip about a mile.
Regards back, I too have stenosis, ruptered disc S1-L5, L5-L4 bluging, I have been taught by physio do not slouch in easy chair, you must sit up straight which is always a battle for me.
If I feel me back starting to twinge its a reminder to me, extra effort is in the local heated pool with a noodle under my arms to stretch me out, and tread water, bycling under in the water, for an hour at a time 3 times a week, never thought it would help, but its been a life saver that I continue to use on a regular basis, I am now two years on from hip replacement, also helps with healing from hip surgery and keeping you nice and strong in your core muscles.
Physio post hip replacement very imprssed with me, 65 yr old lady that can bridge, plank, and do situps with no apparent effort, I put it down to swimming and treading water, and keeping that back surgeon at a distance, apparently their success rate not as high as hip surgeons, or so I am told.
Best wishes from a fellow hippie