I think he was more looking for ideas on the topic not on the type of research.

I believe that the choice of topic for a thesis depends on whether you want to research something of general interest or whatever is currently "in fashion", or whether you are interested to research something that directly relates to your everyday work.
Should the latter be the case (sorry, I must have missed your post before...), my answer is always:

The next time you see this kind of patient, ask yourself for every thing you say (education) or do (touch, instruction) whether you know the evidence behind what you are saying/ doing and write it down if you don't.
By the end of the day you should have a looooooooong list of potential research questions.

Cheers,
Fyzzio