Sarah, I'm so sorry you are having this trouble. I can't add any wisdom to the other posts, Josephine is certainly one of the best placed for that role, however, sharing my experience may help to you know you aren't alone.
As someone who has had the same procedure as you and is at roughly the same recovery stage as you, I can confirm I also get the severe pain over the rear of the same hip although I've not got any signs of subluxing. My physio said it's very important to avoid a limp and I should always use the crutch to keep me straight and upright, her guidance is I'm allowed to go without a crutch if I can walk normally, but if I limp, I must use the crutch. She told my husband that the family must watch me and tell me if I'm not walking normally so I can correct myself, and if that's not possible without too much pain, I need to pick up the crutch. Some days I think that the limping upsets the alignment of the spine and sacroiliac joint, causing the pain, other days I think It's referred pain from the joint, who knows what it really is but I definitely do get the same pain in the rear that you are describing. It's a screaming burning pain at it's worst, a sore ache when it's mild. What sometimes makes me think it is related to the joint is the way it screeches louder, like a shot, when I put my full weight through that leg.
I've given up trying to go solo without the crutch for now, when the pain had been so bad I could barely walk about a week ago, I started to just use it from getting up in the morning, even if it wasn't painful at the time. Pain built up throughout the day, but gradually improved after the first few days. After about a week of this, it has settled considerably, and I managed a fairly long trip to the supermarket yesterday without any major ill effects (with the crutch of course).
I'm by no means pain free yet, but my surgeon has said it can take up to a year to fully reap all the benefits of the operation, In fact he said although we will need to talk about a replacement at some point, even if I was on bended knees begging in his office, he absolutely won't consider it within this first 12 months, as we won't know how well the procedure has worked until that time.
I must say I think I've had very good physio support, and I've been keen on Pilates for years, as I find it easy to modify to avoid my pain, but still keep reasonable muscle tone. I'm not sure where I'd be if I hadn't had that physio support, she's not only assessed where I am at each visit and adjusted the exercises, she has provided emotional support by being understanding and listening to me. If there's anyway you can get a physio appointment, I would recommend you try that. Not all physios are the same, but it's worth a try.
As for using the crutches again, what have you got to lose except some pain? My excrutiatingly painful week was enough to get me over my pride and embarassment issues, the crutch goes everywhere I do for now.
How funny also you're going on holiday in April, so are we. The week after you, to Disneyland Paris, which is going to involve a lot of walking and standing in queues for 4 days. The morning after my op, we told the surgeon and physio about the hol, and they both said that if I have trouble, there are wheelchairs there to hire and joked I might even get to the front of the queue that way. They said by hiring the chair at the beginning of the day, I can push it most of the time, but I'll have an instant seat for when I do need it. Oh I really didn't take them seriously at the time, silly me. I think I might just do that now. If I have trouble, it could be a long walk back to the entrance to get a chair. I'm definitely taking a crutch.
Since I also have the SI area pain, and so do some others who've had THR's, I wouldn't worry too much that it's due to the subluxing, it seems to be one of those things we might have to go through during recovery. It is extremely painful. I have found heat to be very soothing, although ice is also good as it numbs out the surface area nicely. And using the crutch and resting more than moving too much has also helped. I concentrate on non weight bearing exercise, so I don't get too weak.
Sorry this is so long, but I hope it helps you knowing you aren't alone and we understand.
