I wish I understood what I did to make this happen. Of course it is also possible that this happened because of something I didn't do. Like stretching😱
It's always good to have people around that remember your previous injuries better than you do. My Chiropractor Pat reminded me that I've had difficulty with this hip before. True enough. My right hip has been stiff and less flexible than my left for decades now. My attempts at addressing this have been half hearted at best, and as soon as the pain would recede, I'd forget all about it and slack off. It's almost as if I think I'm still 30 and can just barrel through a physical weakness with stubborn forward motion and without addressing the weakness in a determined manner. It seems likely this is the case here.
Dr Pat said to me yesterday, and I am paraphrasing here, If you still want to be able to do long distance backpacking you are probably going to have to figure out how to protect and strengthen your hip. This might be the outcome of not addressing your hip inflexibility and likely muscle imbalance. Or words to that affect. I guess she is probably correct. But will I do it? I might very well be too lazy. Or stubborn. Or in denial. Well, I hope not.
Post appointment update
According to my Chiropractor and PT, my femur is not sitting correctly in my hip socket, which is why the muscles spasm when the leg is in some positions but not in others. It also makes sense out of something that made no sense. So I have exercises to do to gently nudge the femur back into its rightful place. No stretching or strengthening until it's back in place.
No question I'm off the trail for a fair bit of time.