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Hi,
Thanks for your question regarding CRPS (complex regional pain syndrome). There is not a set protocol for scanning this, as what you need to image will be different depending on where the patient is experiencing pain (which part/s of the body are affected). Requests to image an area for this are rather broad. Sonographers can use their clinical questioning to help ascertain more information from the patient. This can include asking about the nature of the pain - is it constant, intermittent, positional, and where its distribution is. Did the patient have any injury or previous surgery (Nerve pain must be considered as it can account for up to 90% CRPS cases, so knowing your dermatomal distributions of sensory innervation and also what type of motor distribution of different nerves, and all the nerves in the area of interest, and proximal and distal to the area of interest is important.
Sonographically, we will be looking for any structural (static or dynamic) change that can be seen.
Please let us know if you were referring to a particular area of the body, as we can possibly provide a more refined answer.