Pain with twisting sounds like disc which would't be evident on x-ray except as reduced space. You may wish to have an MRI. ( which is to say insist on an MRI w and wo/contrast). The disc can cause the vertebral slipping with of loss of disc integrity. Steroid injections have their place. I don't like them because they degrade cartilage. Twisting can also be painful if you have vertebral fissures. An MRI would be helpful in that area too. Have you had dxa.
I have more stenosis in both the cervical and thoracic still mild in the lumbar. I think becaue of chiropractics, which relieves my discomfort completely, but temporarily the scoliosis hasn't advanced.
Scoliosis can be adult onset, but whenever the origin it advances as the muscles, and ligaments adjust. It you can, find a PT who will work the muscle the inside of the curve.
The extent of variation with scoliosis isn't evident on x-ray or on MRI.
You may need a different medical provider.