What do you think this might indicate for a theme/pattern, and do you have an idea how to help?

As far as I researched information regarding Frozen shoulder in the Wiki, Frozen Shoulder is an old brain theme, meaning we have a plus minus reaction. A frozen Shoulder is a muscle hardening or a tissue reinforcement and appears in prolonged or recurring stress phases.

 Biological Meaning:
The meaning lies in the protective stress phase with functional gain of the myofibroblasts, and in the distribution of sensory and motoric information.
(Even though I don’t understand that. How can a frozen shoulder gain function and enhance the sensory and motoric?!?)

When I look under muscles, there is an illustration which shares the information that the shoulder stands for community and responsibility.

I think the sidedness of the frozen shoulder would be very important, so I’d first find out if the client is left or right handed. 
Right: same eye level, left: Hierarchy 

I would try to find answers to following questions:  
When did the pain of the frozen shoulder started? 
What happened around that time?
Does the client try to hold something away from him or tries to keep holding on to something?

See where emotions pop up, ask further and then work towards letting go in any case. The person is invited to let go of the thought that he needs to control the situation or people and maybe he want's learn to embrace whatever is coming. 

That’s my take on it :-)