Pseudoparalysis Of The Arm

Modern Study Review (AI-Generated)

High-Yield Summary

Pseudoparalysis of the arm in neonates is a critical clinical sign indicating severe underlying pathology such as fractures, infection, or nerve injury. Prompt differentiation between orthopedic injury, infection, and brachial plexus palsy is essential to prevent long-term functional impairment. Early diagnosis and targeted management optimize pain relief and preserve arm function, which are the primary clinical goals.

Key Diagnostic Findings

Anatomy

• The proximal humerus contributes approximately 80% of longitudinal growth of the humerus.
• The brachial plexus innervates the upper limb; injury can cause true paralysis or pseudoparalysis.
• The clavicle, scapula, and acromion are common sites of neonatal fractures during difficult deliveries.

Clinical Presentation

• Neonate presents with absence of spontaneous arm movement (pseudoparalysis).
• History often reveals birth trauma risk factors: shoulder dystocia, macrosomia, or difficult delivery.
• Signs of local infection: swelling, erythema, warmth, fever.
• Neurologic exam to differentiate brachial plexus palsy (flaccid limb, absent reflexes) from mechanical causes.

Imaging

• Plain radiographs: first-line to identify fractures of clavicle, proximal humerus, scapula, or acromion.
• Ultrasound: useful for detecting joint effusions (septic arthritis) and soft tissue infections.
• MRI: indicated if brachial plexus injury or deep infection suspected, for detailed soft tissue and nerve visualization.

Classification Systems

• No formal classification system applies specifically to pseudoparalysis; however, neonatal fractures and brachial plexus injuries have established classifications (e.g., Narakas for brachial plexus palsy).
• Infection severity is staged clinically and radiographically.

Current Gold Standard Treatment

Non-operative

• Observation and immobilization for undisplaced fractures (clavicle, proximal humerus).
• Antibiotic therapy tailored to culture results for osteomyelitis or septic arthritis. Early initiation is critical to prevent physeal damage.
• Physical therapy for mild brachial plexus injuries to promote recovery.

Operative

• Surgical drainage and debridement for septic arthritis or osteomyelitis with abscess formation.
• Surgical fixation for displaced fractures causing neurovascular compromise or nonunion.
• Microsurgical nerve repair or grafting in severe brachial plexus palsy cases with no spontaneous recovery by 3-6 months.

Modern Complications & Outcomes

Complications

Outcomes

• Early diagnosis and treatment generally result in excellent functional recovery.
• Delayed or missed infection leads to growth disturbances and chronic disability.
• Most neonatal clavicle fractures heal spontaneously with minimal sequelae.
• Brachial plexus palsy prognosis depends on injury severity; many mild cases resolve within months.

Classic Clinical Notes

Pseudoparalysis of the Arm

The scenario is the neonate who is not moving his arm.

The possibilities:

• fractured clavicle
• fractured proximal humerus
• fractured scapula or acromion
• osteomyelitis of the proximal humerus or clavicle
• septic arthritis of the shoulder
• weird tumour
• brachial plexus palsy

Clinical approach:

• Get a history – birth history – late gestation, huge baby, shoulder dystocia.
• Look for infection! The proximal humerus contributes about 80% of growth – if you miss the proximal humerus infection that bags the physis, you will severely fuck up the arm.
• Check the neurology – is there a discrete or diffuse brachial plexus palsy.

Last Updated on January 25, 2026 by orthonet