The phrase "as a common theme" is correct and usable in written English.
It can be used to indicate a recurring idea or motif in a discussion, analysis, or narrative.
Example: "In many of his works, the struggle for identity appears as a common theme that resonates with readers."
Alternatives: "as a recurring motif" or "as a prevalent idea".
It is precisely because opera is so expensive a beast that it is such a hot political potato, and time and again the fight to balance the books emerges as a common theme.
The emergence of health zealotry and puritanism as a common theme of government, the tyranny of pubcos that sell rent for cheap before squeezing the life out of tenants and cut-price booze in supermarkets are all forces too strong to bear.
Epigenetic deregulation has also been revealed as a common theme across several tumour subtypes.
The environment emerged as a common theme among many of the students.
Integration via perfectly timed highly regulated protein protein interactions and precise targeting of the "output" proteins to particular substrates is emerging as a common theme of signaling regulation.
System goals need to be established with defined objectives, system constraints, and a desired set of outcomes to be used as a common theme throughout the design process.
Education and motivation of patients was a common theme, as well as education of healthcare professionals.
As Roy Hodgson faced the news media on Tuesday for the first time as England manager, a common theme of questioning became apparent: "Why are you not Harry Redknapp?" Indeed, the man who sat between the chairman of the Football Association, David Bernstein, and and its director of football development, Trevor Brooking, was not Redknapp.
As a result, a common theme among many respondents was of planning to remain at home with services until they died.
There may be as many as 12 components organized around a common theme and supported by core facilities.
It's a major factor for a lot of the seniors and patients, if you will, because they are so sick they can't drive and so if family members are not available to drive them then there's limited choices.'" Being viewed as a person and not merely as an illness was a common theme throughout the focus group discussions.
