I'm wondering if anyone here can help figure out the lower back pain I'm currently experiencing. (
@Jaycey?) When I walk longer distances, I get moderate muscular pain in my lower back, especially on the side of my non-operated hip. I'm guessing this is in the lower erector muscles and/or the quadratus lumbarum muscles.
For many years prior to surgery, I had severely limited abduction and reduced adduction in my left hip. And in the last two years (at least), when I walked, I was basically using my left leg as a peg and swinging my right leg out and around to advance my motion.
So now I've got this shiny new hip and no pain in that joint.

And now the rest of my body has to catch up. I've been struggling with my knee and now my lower back is getting into the act but only, I think, because I've been walking longer distances. I feel as though I was probably walking pitched forward, too, as straightening my back and walking with a more normal gait seems to be the cause of my back problems.
Here's the deal. I've been walking more with a new puppy. Then, at work one day, an app that I use on my phone said that I was "about 2 miles" from home. Wait, I can do 2 miles! Well, to be more precise, I work 2.7 miles by foot from home, which is really closer to 3 miles, isn't it? But the idea was planted in my head, so I tried walking it.
I was prepared for the muscles in my legs (both sides) to feel tired, but I wasn't prepared for the muscles in my lower back to hurt (and throb with increased blood flow) so much. I feel as though the back of my pelvis is taking a beating - concentrated mainly on my right side, not my left (operated) side. I'm assuming this is because of various muscles that have compensated and/or tightened due to my congenital deformity. However, any advice or reassurance I can get would be much appreciated.
Is this normal? Do I just need to stretch? Are there specific stretches for my lower back that I should target?
Many thanks for any advice and help!