Try to ask fellow physios in this instance for single case design data, i.e. one patient who benefited from this technique when applied in a way to justify that it was the treatment causing the change. Or if no one can supply data but uses the technique - perhaps be even more radical by outlining a single case design and ask those using the technique to follow your single case guideline and report back to you!
Numerous single case techniques are perhaps more powerful than any RCT