CRPS Expert Witness

Complex regional pain syndrome is the most contested diagnosis in personal injury litigation. There is no imaging study or blood test that confirms it, the symptoms are disproportionate to the original injury by definition, and the condition is diagnosed by clinical criteria that require the examiner to exclude other explanations. That combination makes it the diagnosis defense counsel most often attributes to exaggeration or malingering, and it makes expert selection more consequential than in almost any other injury type.

The diagnostic framework

Modern diagnosis runs on the Budapest Criteria, adopted by the International Association for the Study of Pain and now the accepted standard in both clinical practice and litigation. They require continuing pain disproportionate to the inciting event, plus specified combinations of reported symptoms and observed signs across four categories: sensory, including hyperalgesia and allodynia, vasomotor, including temperature and skin color asymmetry, sudomotor and edema, including swelling and sweating changes, and motor or trophic, including weakness, tremor, reduced range of motion, and changes to hair, nail, and skin.

The critical point for litigation is the distinction between symptoms the patient reports and signs the examiner observes. The research criteria require both, and a diagnosis based purely on subjective report is vulnerable. An expert who can point to documented objective findings, particularly temperature asymmetry measured on examination, visible color and swelling changes, and trophic changes photographed over time, is in a far stronger position than one relying on the patient's pain description.

Older terminology still appears in records. Reflex sympathetic dystrophy and causalgia were the prior names, now designated CRPS Type I, without confirmed nerve injury, and Type II, with it. Records using the old terms are not disqualifying, but an expert should explain the evolution.

Where these cases get attacked

The criteria were never applied. Many treating physicians document a CRPS impression without working through the Budapest framework or recording the required findings. A defense expert will point out that the criteria were not applied, and if the record contains no documented objective signs, that argument lands.

Alternative explanations were not excluded. The criteria require that no other diagnosis better accounts for the findings. Untreated nerve entrapment, infection, vascular disease, and rheumatologic conditions all need to be considered and ruled out.

Inconsistency in the record. Documentation of full range of motion at one visit and severe restriction at the next, normal appearance in some notes and dramatic findings in others. These cases live and die on consistency across providers.

Surveillance. Defense investigators film these plaintiffs frequently, and footage showing use of the affected limb is the most common tool used against them. The response usually addresses the fluctuating nature of the condition and the difference between brief activity and sustained function, which a credible expert can explain but which is harder when the record itself is inconsistent.

Psychological attribution. The defense position that symptoms are psychogenic or somatic in origin. Current understanding treats CRPS as a genuine neurological condition with central and peripheral mechanisms, and an expert should be prepared to address the literature rather than dismiss the argument.

Which experts handle these cases

Pain management physicians, usually anesthesiologists or physiatrists with pain fellowship training, are the most common primary expert. They address diagnosis, the treatment course including sympathetic blocks and their diagnostic value, medication management, and interventional options such as spinal cord stimulation.

Neurologists address the neurological basis, differential diagnosis, and the relationship between the inciting trauma and the condition. They are particularly useful where Type II is at issue and nerve injury must be established.

Physical medicine and rehabilitation physicians address functional capacity, impairment rating, and the rehabilitation course, and are often the most useful for connecting the diagnosis to actual work restrictions.

Orthopedic surgeons come in where the inciting injury was a fracture or surgery and causation between the procedure and the syndrome is disputed.

Psychiatrists and psychologists address the psychological consequences, which are substantial in chronic CRPS, and rebut malingering allegations. Validity testing and symptom validity assessment appear regularly on both sides.

Life care planners and vocational experts carry the damages side, which is where these cases produce value, since CRPS frequently ends careers in people who are otherwise young and healthy.

Causation and timing

The inciting event is often minor: a wrist fracture, a sprain, a routine surgery, sometimes an injury that healed normally before symptoms began. That disproportion is part of the diagnosis, but it makes causation testimony essential, because juries struggle with the idea that a small injury produced a catastrophic outcome.

The temporal relationship matters. Symptoms typically begin within weeks to a few months of the inciting event, and a gap of a year or more invites serious challenge. Documentation of the progression, particularly early notes describing swelling, color change, or disproportionate pain, is often the most valuable material in the file even when nobody named the condition at the time.

Preexisting conditions and prior injuries to the same limb complicate this considerably and should be identified before the expert forms an opinion.

Damages

These cases produce large numbers when they hold up. The condition is frequently permanent, treatment is ongoing and expensive, spinal cord stimulator implantation and maintenance carry substantial lifetime costs including generator replacements, and the functional loss often precludes returning to physical work.

A life care plan typically includes ongoing pain management, medication including compounded topicals and neuropathic agents, interventional procedures on a recurring basis, device costs and revisions, therapy, psychological treatment, and in severe cases attendant care. Present value work by an economist follows.

Fee expectations

Pain management physicians and neurologists generally charge $500 to $900 an hour for review and report work, with deposition and trial time often billed at a higher rate or as a half day. Physiatrists typically run $400 to $700. Neuropsychologists performing validity assessment charge for testing time in addition to review. Life care planners run $200 to $400 with a substantial hour commitment in these cases. Total expert cost commonly lands between $25,000 and $60,000 through trial.

Frequently asked questions

Is a positive response to a sympathetic block diagnostic?

No. Response to sympathetic blockade was historically treated as confirmatory and is no longer considered diagnostic, since both false positives and false negatives are common. It remains useful therapeutically and as one piece of the clinical picture.

Can a treating physician establish the diagnosis alone?

Sometimes, but treating physicians frequently document the impression without applying the Budapest Criteria on the record. A retained expert who can walk through the criteria against the documented findings usually strengthens the case considerably.

What if the records use RSD instead of CRPS?

That is common in older records and is not a problem. The terminology changed, and an expert should explain the relationship between the old and current nomenclature.

How is malingering addressed?

Through documented objective signs that are difficult to produce voluntarily, such as temperature asymmetry and trophic changes, consistency across independent providers, and where appropriate, formal validity testing by a neuropsychologist.

Does surveillance footage end the case?

Rarely by itself. The condition fluctuates and brief observed activity does not establish sustained functional capacity. The problem is when footage contradicts specific claims the plaintiff made under oath, which is a credibility issue rather than a medical one.

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