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Morbus Sudeck: Causes, Symptoms & Treatment

Morbus Sudeck, also known as Complex Regional Pain Syndrome (CRPS), is a chronic pain condition typically triggered by injury, causing severe pain, swelling, and limited movement.

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Things worth knowing about "Morbus sudeck"

Morbus Sudeck, also known as Complex Regional Pain Syndrome (CRPS), is a chronic pain condition typically triggered by injury, causing severe pain, swelling, and limited movement.

What is Morbus Sudeck?

Morbus Sudeck, now officially known as Complex Regional Pain Syndrome (CRPS), is a chronic pain condition that primarily affects one limb – most commonly an arm or leg. It was first described by the German surgeon Paul Sudeck in 1900. The condition is characterized by persistent, disproportionately severe pain that exceeds the expected level of pain following an initial injury or surgical procedure.

Causes

Morbus Sudeck most often develops after an injury or surgical procedure, but can also occur without an identifiable trigger. Common causes and risk factors include:

Bone fractures, especially of the wrist
Surgeries involving joints or extremities
Crush injuries, sprains, or strains
Immobilization in a cast
Stroke or heart attack (less commonly)

The exact cause is not yet fully understood. It is believed that a dysfunction of the nervous system – both central and peripheral – combined with an exaggerated inflammatory response plays a key role in the development of the condition.

Symptoms

The symptoms of Morbus Sudeck can progress through three stages:

Stage I (acute): Burning, severe pain, warmth, redness, and swelling of the affected area
Stage II (dystrophic): Persistent pain, cooling and discoloration of the skin, stiffness and reduced range of motion
Stage III (atrophic): Chronic pain, wasting of muscle and bone tissue, permanent movement limitations

Additional symptoms may include hypersensitivity (allodynia), changes in sweating and hair growth, as well as psychological effects such as anxiety and depression.

Diagnosis

The diagnosis of Morbus Sudeck is primarily clinical, as there is no single definitive test. Physicians rely on:

The Budapest Criteria: an internationally recognized diagnostic framework that evaluates symptoms in four categories (pain, sensory changes, vascular changes, motor and trophic changes)
Imaging such as X-ray, MRI, or bone scintigraphy to exclude other conditions
Thermography to measure temperature differences between limbs

Treatment

Early treatment is crucial for a successful outcome. The therapeutic approach is multidisciplinary and includes:

Medication

Pain relievers (e.g., NSAIDs, opioids in severe cases)
Corticosteroids to reduce inflammation
Bisphosphonates to address bone changes
Antidepressants and anticonvulsants for pain modulation

Physiotherapy and Occupational Therapy

Targeted movement exercises and desensitization therapies help to restore function in the affected limb and reduce pain levels over time.

Psychological Support

Since chronic pain is frequently associated with psychological distress, psychological support and cognitive behavioral therapy are important components of comprehensive treatment.

Interventional Procedures

Sympathetic nerve blocks
Spinal cord stimulation for treatment-resistant cases

Prognosis

The prognosis depends greatly on the timing of treatment initiation. With early intervention, a full recovery is possible. However, chronic courses with lasting limitations are not uncommon, especially when diagnosis and treatment are delayed.

References

Harden R.N. et al. - Validation of proposed diagnostic criteria (the Budapest Criteria) for Complex Regional Pain Syndrome. Pain, 2010. PubMed PMID: 20493633.
Moseley G.L. - Graded motor imagery for pathologic pain: a randomized controlled trial. Neurology, 2006. PubMed PMID: 16432139.
Birklein F. et al. - Complex regional pain syndrome – an optimistic perspective. Neurology, 2018. PubMed PMID: 29248964.

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