I would also be incredibly interested in an answer on this question, since Andreas exactly describes a condition that I am suffering from. Rounded and stiffened T-spine, overextension in the lumbar spine and a terribly winging scapula on the right side. My scapula on the left side is also winged, but far less than on the right side. I have the feeling that this make mobilizing for shoulder rotation much more difficult. The worst thing though is the rounded stiffened T-Spine which I believe is the cause for many other things going wrong in my back.
Looking forward for an answer!
Thanks a lot if advance!