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Klumpke’s Palsy (Lower Brachial Plexus Injury)

What is Klumpke's palsy (lower brachial plexus injury)?

Klumpke’s palsy is a type of brachial plexus injury that affects the **lower trunks (C8–T1)** of the brachial plexus, the network of nerves that originates from the spinal cord in the neck and supplies the arm, hand, and some chest muscles. When these nerves are stretched, compressed, or torn, the muscles they innervate become weak or paralyzed, leading to a characteristic “claw‑hand” deformity, loss of sensation in the fourth and fifth fingers, and sometimes weakness of the intrinsic hand muscles.

The condition is named after Adolf Klumpke, the 19th‑century Swiss neurologist who first described the pattern of injury. It is less common than the upper‑plexus counterpart (Erb’s palsy) but can be equally disabling, especially when the injury involves the T1 root that also contributes to the sympathetic fibers of the hand.

Common Causes

Klumpke’s palsy usually results from a sudden, forceful movement that stretches the lower part of the plexus. The most frequent scenarios include:

• Traction injuries during childbirth – especially when the infant’s shoulder is pulled upward (e.g., excessive upward traction on the head or a breech delivery).
• Falls from height – landing on an outstretched hand while the arm is abducted.
• Motor‑vehicle collisions – occupants who brace with an outstretched arm or who suffer a “dashboard injury”.
• Sports injuries – high‑impact sports such as rugby, football, gymnastics, or wrestling where the arm is pulled violently.
• Industrial accidents – getting the arm caught in machinery or a sudden yank on a rope or cable.
• Animal bites or crush injuries – especially to the upper forearm or elbow.
• Penetrating trauma – stab or gunshot wounds that transect or severely damage the lower trunks.
• Neoplastic or inflammatory processes – rare tumors (e.g., schwannoma) or severe inflammatory neuropathies that compress the lower plexus.
• Viral infections – certain viruses (e.g., Herpes zoster) can cause a radiculitis that mimics plexus injury.
• Congenital malformations – rare developmental anomalies that leave the lower plexus vulnerable.

Associated Symptoms

Because the C8–T1 roots supply both motor and sensory fibers, a spectrum of signs may appear, often together:

• Motor deficits
  • Weakness or paralysis of the intrinsic hand muscles (interossei, lumbricals) → “claw hand”.
  • Weakness of flexors of the wrist and fingers (especially the ring and little fingers).
  • Possible weakness of the triceps (if C7 involvement extends).
• Sensory loss
  • Numbness, tingling, or burning sensation in the medial forearm, fourth and fifth fingers, and sometimes the hypothenar eminence.
• Autonomic signs (Horner’s syndrome)
  • Ptosis (drooping eyelid), miosis (constricted pupil), anhidrosis (lack of sweating) on the same side of the face – occurs when the T1 sympathetic fibers are damaged.
• Pain – ache or sharp shooting pain radiating from the neck or shoulder down the arm.
• Muscle atrophy – visible wasting of hand muscles within weeks to months if untreated.
• Functional limitations – difficulty with gripping, writing, buttoning, or any fine‑motor activity.

When to See a Doctor

Prompt evaluation is critical. Seek medical attention if you notice any of the following:

• Sudden loss of movement or strength in the hand or fingers.
• Persistent numbness or tingling that does not improve within a few hours.
• Visible claw‑hand deformity or muscle wasting.
• Severe pain that interferes with sleep or daily activities.
• Signs of Horner’s syndrome (uneven pupil size, drooping eyelid, facial sweating changes).
• Any trauma to the shoulder, neck, or arm where you cannot move the limb normally.

Children born with a suspected brachial plexus injury should be evaluated within 24 hours of birth. Early physiotherapy significantly improves outcomes.

Diagnosis

Diagnosing Klumpke’s palsy involves a combination of clinical assessment and imaging/electrodiagnostic studies.

Clinical Examination

• Inspection for claw hand, muscle bulk loss, and Horner’s syndrome.
• Manual muscle testing of the intrinsic hand muscles (e.g., interossei, thenar/hypothenar groups).
• Sensory testing of the medial arm, forearm, and ulnar side of the hand.
• Provocative maneuvers (e.g., Tinel’s sign over the supraclavicular fossa) to localize nerve irritation.

Electrodiagnostic Studies

• Electromyography (EMG) – evaluates electrical activity of affected muscles and helps differentiate between neuropraxia, axonotmesis, or neurotmesis.
• Nerve conduction studies (NCS) – measure speed and amplitude of signals across the lower trunks.

Imaging

• MRI of the brachial plexus – high‑resolution images to detect nerve root avulsion, neuroma, or surrounding soft‑tissue injuries.
• CT myelography – useful when MRI is contraindicated; highlights root disruptions.
• Ultrasound – increasingly used for real‑time assessment of nerve continuity, especially in infants.

Additional Tests

• Chest X‑ray or CT to look for associated rib or clavicular injuries that may contribute to traction.
• Blood work if an inflammatory or infectious cause is suspected.

Treatment Options

Treatment is tailored to the severity of the injury, the patient’s age, and the time elapsed since onset.

Conservative (Non‑Surgical) Management

• Physical therapy – early passive range‑of‑motion (PROM) exercises prevent joint stiffness; later, active strengthening of hand and forearm muscles.
• Occupational therapy – task‑specific training, splinting, and adaptive equipment to maintain function in daily activities.
• Pain control – NSAIDs, acetaminophen, or short courses of neuropathic agents (gabapentin, pregabalin) for nerve‑related pain.
• Serial casting or dynamic splints – maintain proper wrist and finger positioning and discourage contractures.
• Neuromodulation – in refractory pain, transcutaneous electrical nerve stimulation (TENS) or peripheral nerve stimulation may help.

Surgical Options

Surgery is usually considered when: i) there is no clinical improvement after 3–6 months, ii) EMG shows poor regeneration, or iii) there is a clear nerve root avulsion.

• Neurolysis – freeing the nerve from scar tissue.
• Nerve grafting – using autologous sural nerve grafts to bridge gaps.
• Nerve transfer – redirecting a less‑critical donor nerve (e.g., spinal accessory, radial branch) to re‑innervate the affected muscles.
• Muscle/tendon transfers – for chronic cases where re‑innervation is unlikely; transfers such as the flexor carpi ulnaris to restore finger flexion.
• Repair of associated injuries – fixation of fractures or clavicular injuries that contributed to traction.

Outcomes are best when surgery is performed within the first 6–12 months, especially in children whose nerves have greater regenerative potential.

Home Care & Self‑Management

• Follow the therapist’s home‑exercise program at least 2–3 times daily.
• Keep the hand elevated to reduce swelling during the acute phase.
• Use ergonomic tools (larger‑handle utensils, adaptive keyboards) to reduce strain.
• Monitor skin integrity; reduced sensation increases the risk of ulceration.
• Maintain a balanced diet rich in protein, vitamin B12, and omega‑3 fatty acids to support nerve healing.

Prevention Tips

While not all injuries are avoidable, certain strategies can reduce the risk:

• Safe delivery practices – obstetric maneuvers that avoid excessive traction on the infant’s shoulders; consider assisted delivery (forceps/vacuum) only when clearly indicated.
• Protective equipment – wear helmets, padded gloves, and elbow/knee pads during high‑impact sports.
• Proper technique – learn correct lifting, pulling, and weight‑bearing mechanics; keep the spine neutral and avoid sudden jerks.
• Workplace safety – use harnesses and secure rope systems; never pull heavy loads with an outstretched arm.
• Childproofing – keep edges and hard surfaces padded; supervise toddlers to prevent falls from furniture.
• Strength and flexibility training – regular shoulder and upper‑back conditioning improves muscular support around the plexus.

Emergency Warning Signs

Key Take‑aways

Klumpke’s palsy is a lower‑brachial‑plexus injury that can lead to significant hand disability if not recognized early. Prompt assessment, appropriate imaging, and early rehabilitation improve the odds of functional recovery. In cases where nerves fail to regenerate, surgical options exist, especially when performed within the first year. Prevention focuses on safe handling during childbirth, protective strategies in sports and work, and education on proper body mechanics.

For the most current guidelines, consult reputable sources such as the Mayo Clinic, CDC, NIH, Cleveland Clinic, and peer‑reviewed journals from The Journal of Neurosurgery and Neurosurgery.

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