Frozen Shoulder or Impingement?   What is the connection between frozen shoulder and diabetes?  A frozen shoulder seems to result from the way the brain responds to inflammation around the long head of the biceps in the rotator interval. In some people, and we still don’t know why, the brain over-reacts to this inflammation by switching off groups of muscles and changing their dynamics. We do know however, that frozen shoulder is much more common in diabetics. About 20% of diabetics are affected compared to around 5% of the general population. It is not clear why this should be...