I seem to be saying to everyone that posts - that sounds like me! I have a few problems all layered over each other LOL
Here’s my thoughts on your problem (based upon my own experiences).
A sacral torsion / twisted pelvis will result in a leg length discrepancy and can potentially cause all the other symptoms you mention. It can even result in a hip impingement in a similar way that scapular instability can result in a shoulder impingement.
The sacrum is the bone at the bottom of your spine. During normal gait the sacrum tilts and rotates to the right and left. The innominates (wings of the pelvis) and spine move in relation to the sacrum. So when the sacrum side bends and rotates one way the lumber spine does the exact opposite and the thoracic spine does the opposite to the lumber spine. When the sacrum tilts and sidebends one way the innominate on that side goes into inflare, posterior rotation and downslip. The innominate on the other side does the opposite. In this position the leg on one side will temporarily be longer than the other. For various reasons, the sacrum can ‘stick’ at any point (or just be more mobile on one side than the other). If this happens you end up with a twisted, tilted pelvis, an apparent leg length discrepancy and a whole host of other problems - essentially your entire spine, pelvis and legs are ‘stuck’ in the wrong position and muscles are going into overdrive trying to stabilize you.
With all the boney landmarks out of alignment some muscles are stretched too tight (no amount of stretching and foam rolling will loosen them because they’re already over-stretched). Other muscles are loose and in a compromised position where they can’t fire properly. In order to stabilize you your nervous system recruits other muscles to do the job and this can (as well as causing a whole bunch of ROM problems and sore, tight muscles) result in the femur being pulled into the wrong position in the acetabulum. So essentially a hip impingement - but one that will be resolved if you restore correct muscle balance.
This was one of my many issues. The doctors diagnosed it (incorrectly) as hip OA. The ‘hard end feel’ that they said was bone on bone and irreversible has actually been reversed as my sacrum/pelvis leveled out!
It’s not an easy fix. Once your body gets itself locked into this kind of pattern it’s very tricky to persuade it to let go. I’ve had zero success with health professionals (doctors, physios, chiros, osteopaths etc). There are people online that do understand this type of problem though - NeuroKinetic Therapy, Postural Restoration Institute, Eric Dalton etc.
Knowing that you have a sacral torsion doesn’t really solve the problem as a sacral torsion is really just the result of a muscle imbalance. But because of the way in which the body works as a unit (innominates, lumber, thoracic spine all moving in a fixed pattern around the sacrum), knowing what the sacrum is doing gives you a very clear idea of what’s going on with the rest of your body. And this can help you unravel the puzzle.
Of course, I can’t guarantee that you don’t have true structural hip impingement - so be careful. And even if your problems have a soft tissue cause it’s really not a gppd idea to be squatting with bad form as you’ll just compound the problem. Better to back off on weight and height to a rom that you can do perfectly and build up from there.
These articles will be of interest: