Here is a link.
http://orthopedics.about.com/cs/frozenshoulder/a/frozenshoulder.htm
Just because your thyroid test results fall within the so-called "normal" ranges does not mean that is adequate for YOU. The ranges are far too broad. If you will please post your test results and reference ranges shown on the lab report, members will be better able to comment on the adequacy of your testing and diagnosis.
I can't locate it right now, but I just ran across something about frozen shoulder sometimes being related to hypothyroidism.