Complex Regional Pain Syndrome (CRPS) Lawyer in Phoenix, Arizona

What CRPS Is — Type I and Type II

Complex regional pain syndrome is a chronic pain condition in which pain persists and intensifies far beyond what the original injury would explain, and beyond the time the tissue should have healed. It was formerly known as reflex sympathetic dystrophy, or RSD, and older medical records and older adjusters still use that term. Causalgia is the historical name for the version that follows a confirmed nerve injury.

The condition is divided into two types by a single distinction. CRPS Type I develops after an injury with no identifiable nerve damage — a fracture, a sprain, a crush injury, a surgery, or in many cases an event that seemed minor at the time. CRPS Type II develops after a documented injury to a specific nerve. The symptoms, the course, and the treatment are essentially the same; the difference is whether a discrete nerve lesion can be identified.

CRPS usually begins in one limb — a hand, an arm, a foot, or a leg — and the pain is characteristically out of proportion to the inciting event. Patients describe burning, deep aching, or electric shock sensations. Two specific features recur and matter enormously in a legal claim because they are difficult to fake and easy to document: allodynia, in which ordinary non-painful contact such as a bedsheet, a sock, clothing, or a breeze produces real pain; and hyperalgesia, in which mildly painful stimuli produce pain far out of scale.

Alongside the pain come autonomic and trophic changes in the affected limb. The skin may change color, shifting to red, purple, blue, or mottled. The temperature of the limb may differ noticeably from the opposite side, running hotter or colder. Swelling is common. Sweating patterns change. Hair and nail growth in the affected area speeds up or slows down. Over time the joints stiffen, the muscles weaken and waste from disuse, and some patients develop dystonia — sustained abnormal posturing of the limb. In some patients symptoms spread beyond the original site.

CRPS is recognized in the medical literature as one of the more severe chronic pain conditions. It is not a psychological condition, and it is not a description of someone who is unusually sensitive to pain. The reason that clarification is necessary is that the psychological framing is the defense argument these claims almost always face.

How a Seemingly Minor Crash Triggers a Severe Condition

One of the defining features of CRPS is that the severity of the syndrome bears no reliable relationship to the severity of the injury that set it off. A wrist fracture, a sprained ankle, a seat-belt or airbag contact injury, a knee twisted in a low-speed rear-end collision, a hand caught in a door, a needle stick, or an uncomplicated surgery can all precede it. Some cases follow an immobilization period in a cast or splint.

That mismatch is medically well described and legally inconvenient, because a great deal of insurance claim handling is built on the intuitive assumption that minor property damage means minor injury. When a person walks away from a moderate collision and, six weeks later, cannot tolerate a sock touching their foot, the adjuster's first instinct is that something other than the crash must be responsible.

Arizona law does not adopt the adjuster's intuition. A defendant is responsible for the harm actually caused, not the harm that would typically be expected from the same event. That principle is often summarized in the phrase that a defendant takes the plaintiff as they find them: if a person's physiology responds to a modest injury with a severe chronic pain syndrome, the negligent party is responsible for that outcome. Whether CRPS was in fact caused or triggered by the incident is a medical causation question resolved by qualified opinion testimony — not by the repair estimate on the vehicle.

Proving causation in these cases rests on a small number of concrete things. The timeline matters most: symptoms that begin in the injured limb within days or weeks of the incident, documented contemporaneously, are the backbone of causation. Absence of the same symptoms before the incident matters, which is why complete prior medical records help rather than hurt when the history is clean. And the treating specialists' own causation statements, made in the ordinary course of treatment, are usually more persuasive than an expert retained afterward.

Because low-visible-damage collisions are the ones insurers fight hardest, these claims also frequently involve the standard low-impact defense playbook. Our car accidents page covers how those arguments work and what counters them.

The Diagnosis Problem: No Single Test and the Budapest Criteria

There is no blood test, no scan, and no single study that establishes CRPS. It is a clinical diagnosis, made by a physician evaluating the pattern of symptoms and physical findings and excluding other conditions that could explain them. That is a normal state of affairs in medicine, and it is the opening the defense uses.

The standard framework is the Budapest criteria, developed by consensus and widely used in clinical practice and research. Under that framework, diagnosis requires continuing pain disproportionate to the inciting event, together with reported symptoms across defined categories and, importantly, signs observed by the examining clinician in at least two of those categories. The categories cover sensory findings such as allodynia and hyperalgesia; vasomotor findings such as temperature asymmetry and skin color changes or asymmetry; sudomotor and edema findings such as swelling and sweating changes; and motor and trophic findings such as decreased range of motion, weakness, tremor, dystonia, and changes in hair, nail, or skin growth. The diagnosis also requires that no other diagnosis better explains the presentation.

The distinction between a reported symptom and an observed sign is the single most useful thing to understand about proving one of these claims. A symptom the patient describes can be disputed as subjective. A sign the physician measures or observes — a documented temperature difference between limbs, a photographed color change, measured swelling, a recorded loss of range of motion — is objective evidence in the record.

Supporting studies do not diagnose CRPS on their own but can corroborate it. Three-phase bone scans, thermography documenting temperature asymmetry, quantitative sensory testing, and plain films showing patchy demineralization in the affected limb are used in various combinations. Electrodiagnostic testing may identify the nerve lesion in Type II. A sympathetic nerve block that relieves the pain provides supporting evidence as well, though a block that fails does not rule the condition out.

Why insurers attack these claims: the absence of a definitive test lets the defense argue that the pain is exaggerated, that it is psychological, that it is pre-existing, that the diagnosis was made too readily by a treating physician sympathetic to the patient, or that the person is simply not trying to recover. The counter is a record built on observed signs, consistency over time across multiple independent providers, formal application of the Budapest criteria by a specialist, and objective functional evidence of what the person can no longer do.

Treatment: Blocks, Ketamine, Stimulators, and What It Costs

CRPS treatment is escalating and long-term. There is no single cure, the response varies substantially between patients, and most treatment plans combine several approaches at once.

The foundation is usually physical and occupational therapy aimed at restoring movement and desensitizing the limb, often including graded motor imagery and mirror therapy. Therapy for CRPS is uniquely difficult, because the treatment requires moving and touching a limb that hurts to move and touch, and patients who stop are frequently accused later of non-compliance rather than credited with having tried.

Medication management typically involves neuropathic pain agents rather than ordinary analgesics — gabapentin, pregabalin, certain antidepressants used for nerve pain — along with topical agents, and in some cases bisphosphonates or short courses of corticosteroids. Opioids are used cautiously and create their own complications in a claim.

Interventional treatment escalates from there. Sympathetic nerve blocks — a stellate ganglion block for upper-extremity CRPS, a lumbar sympathetic block for the lower extremity — are both diagnostic and therapeutic, and they are frequently repeated in a series. Intravenous ketamine infusion protocols are used for refractory cases, sometimes as outpatient sessions and sometimes in an inpatient setting, and they may be repeated periodically to maintain benefit. Spinal cord stimulation involves surgically implanting leads near the spinal cord and a pulse generator under the skin, usually after a trial period; the device requires programming, maintenance, and eventual battery replacement surgery on a recurring cycle. Intrathecal pump implantation delivers medication directly and requires ongoing refills and eventual replacement.

Because chronic severe pain and psychological distress interact, pain psychology and mental health treatment are standard parts of the plan, not add-ons. Sleep disturbance, depression, and anxiety are documented consequences of the condition. Insurers regularly attempt to reframe that treatment as evidence that the problem was psychological all along, which is exactly backwards.

The financial dimension follows from the structure of the treatment. These are recurring costs over a working lifetime rather than a fixed course that ends. Valuing the claim correctly requires a life care plan that accounts for repeat blocks, ongoing medication, device maintenance and replacement cycles, therapy, mental health treatment, and the realistic likelihood of future escalation — and an economist to reduce those recurring costs to present value.

Why Early Specialist Diagnosis Matters — Medically and to the Claim

Early recognition matters clinically. The medical literature consistently associates earlier diagnosis and earlier initiation of treatment — particularly movement-based therapy — with better functional outcomes, while prolonged immobilization and delayed treatment are associated with worse ones. Many patients spend months being told the pain is normal post-injury soreness before anyone applies the diagnostic criteria.

Early diagnosis matters just as much to the claim, for three separate reasons.

First, causation. A diagnosis made within weeks or a few months of the incident, in the limb that was injured, with contemporaneous documentation of the symptoms as they developed, makes the causal link straightforward. A diagnosis made two years later, after a documentation gap, invites the argument that something in the intervening period is responsible.

Second, treatment gaps. Insurers treat any gap in treatment as evidence that the person was not really hurting. Gaps in CRPS cases usually have real explanations — the patient could not get a referral, could not afford care, or was told nothing was wrong — but those explanations have to be in the record rather than supplied at deposition.

Third, the referral chain. A CRPS diagnosis from a pain management physician, a neurologist, or a physiatrist who applied the Budapest criteria and documented the observed signs is durable. A note in a primary care chart that says only "possible RSD" is not, and it becomes a target.

Building proof of an invisible injury comes down to consistency and objectivity:

• Treating specialists carry the case. Their records were created to guide treatment, which makes their conclusions harder to characterize as litigation-driven.
• Observed signs must be documented at each visit — temperature comparison between limbs, skin color, measured swelling, range of motion in degrees, and specific allodynia findings.
• Dated photographs of visible color and swelling changes, taken during flares, capture what a clinic visit weeks later cannot.
• A daily symptom and function journal establishes the pattern and answers the surveillance video that shows one good hour on one good day.
• Before-and-after witnesses — a spouse, a supervisor, a coworker, a longtime friend — describe concrete changes in specific terms, which reaches a jury more effectively than a pain scale.
• Employment records, job modification requests, and attendance history document the occupational impact objectively.
• Complete prior medical records should be gathered early rather than discovered by the defense, because a clean prior history is an asset and a known prior condition is manageable when it is addressed on your terms.
• Avoid recorded statements and blanket medical authorizations, which allow the defense to comb an entire medical history for anything reframeable as a pre-existing pain complaint.

We handle CRPS claims on a contingency fee. The consultation is free and there is no fee unless we recover. Call (602) 217-0000. Related pages: car accidents and catastrophic injuries.

The Arizona Legal Framework in a CRPS Case

No cap on compensatory damages. Article 2, Section 31 of the Arizona Constitution bars any law limiting the amount of damages recoverable for causing death or injury. In a CRPS case the largest components are usually future medical care, loss of earning capacity, and pain — precisely the categories that damage caps target in other states. Arizona does not permit them.

Pure comparative fault. Under A.R.S. § 12-2505, an injured person's recovery is reduced by their own share of fault but is never eliminated by it. There is no threshold at which the claim disappears.

Deadline. A.R.S. § 12-542 requires most personal injury actions to be filed within two years of the date the cause of action accrues. This deadline creates a particular difficulty in CRPS cases, because diagnosis frequently comes many months after the incident and treatment is still escalating when the two-year mark arrives. The right response is not to wait for the medical picture to stabilize — it is to protect the deadline while the treatment continues. Where a public entity or employee is involved, A.R.S. § 12-821.01 requires a written notice of claim within 180 days and A.R.S. § 12-821 requires suit within one year, which compresses everything dramatically.

The eggshell plaintiff rule. Arizona follows the principle that a defendant is liable for the full extent of the harm caused, even when the injured person's particular susceptibility made the outcome far worse than expected. A negligent driver does not escape responsibility because most people would have recovered from the same collision. This principle is the legal answer to the most common defense theme in CRPS litigation.

Pre-existing conditions and aggravation. Where an existing condition is made worse, Arizona permits recovery for the aggravation. Prior records are not fatal to a claim; they are managed by establishing the person's baseline function before the incident and documenting the change.

Evidentiary reality. Because CRPS has no confirmatory test, these cases are won on the quality and consistency of the medical record and on qualified treating-specialist testimony that applies the recognized diagnostic criteria and states the causal connection. That record is built during treatment, not at the end of the case, which is why involving counsel early changes outcomes.