Klumpke's palsy

How does this happen?

The C8 and T1 nerve roots leave the spinal cord low in the neck and supply the small muscles of the hand, the muscles that bend the fingers, and part of the wrist.

These roots are stretched when the arm is pulled upward and away from the body, which widens the angle at the lower part of the bundle. That is a different mechanism from the one that injures the upper roots, and it is one reason Klumpke's palsy is associated with different birth circumstances, including breech deliveries where the arm is extended above the head. ¹

T1 also carries nerve fibers that run up to the eye. When T1 is injured close to the spinal cord, those fibers are affected too, producing Horner syndrome: a droopy eyelid and a smaller pupil on the same side. That sign is important, because it suggests the injury is at the root itself rather than further along, and root injuries are more often avulsions. ¹

The typical picture is a limp hand with a working shoulder and elbow, sometimes described as a claw hand once some recovery occurs, with the wrist held out and the fingers curled.

What causes it?

Two different questions get mixed together here. The first is what leads to this injury in the body. The second is whether anyone could have prevented it. They are not the same question, and the answer to the first does not settle the second.

Happens even with perfect care

• shoulder dystocia managed correctly. The maneuvers used to free a stuck shoulder are forceful, and injury can occur despite correct technique. Guidance states this directly. ³
• Births with no shoulder dystocia recorded, and cesarean births, in which these injuries also occur. ³
• A large baby, where ultrasound weight estimates carry substantial error and cannot reliably predict who is at risk. ⁴
• Maternal diabetes, which changes how weight is distributed on the baby. ⁵
• breech birth or a very fast second stage. ⁶

Associated with gaps in care

These are situations where published standards say what the care team should watch for and do. A gap here does not prove anyone caused your child's injury. It points to where the medical records will have an answer.

• A shoulder dystocia managed outside the recognized sequence, which begins with the McRoberts maneuver and suprapubic pressure. Fundal pressure is specifically discouraged. ³
• Excessive or wrongly directed traction on the head. ³
• Risk factors not considered, including when cesarean may be offered for suspected macrosomia. ⁴
• Gestational diabetes not screened for or not managed. ⁵
• The event not documented with the maneuvers used, in order, with times.
• The injury not recognized before discharge. ⁷
• Specialist referral delayed past the surgical window. ²

Whether any of this amounts to a departure from the standard of care takes a physician expert reading the whole record. These injuries occur after correctly managed births, and guidance says so plainly. ³

What are the signs, by age?

Signs change as a child grows. A newborn cannot show you a walking problem. Some children look fine at first and show differences months later.

At birth and the first hours

• A limp hand and wrist, with the shoulder and elbow moving.
• Absent grip on that side.
• A droopy eyelid and a smaller pupil on the same side, which is Horner syndrome.
• Absent startle response on that side.
• Any breathing difficulty needs urgent assessment.

The first week

• Continued absent grip.
• Horner syndrome, if present, persists.
• Reduced sensation in the hand, which can be hard to assess in a newborn but shows later as a child not noticing injuries to that hand.

Around 3 months

• Some return of wrist and finger movement in babies recovering well.
• Persistent absent grip, which is a warning sign.
• Early stiffness in the fingers.

Around 6 months

• The checkpoint. No meaningful hand function by now means specialist surgical evaluation. ²
• A hand held in a curled position.
• Complete lack of use of that hand.

Around 12 months

• A hand that is smaller than the other.
• Fingers held curled, with tightness developing.
• The child using the affected arm as a helper only.

Toddler years

• Difficulty grasping and releasing.
• Not noticing cuts, burns or pressure on that hand, because sensation is reduced. This is a safety issue worth raising specifically.
• Difficulty with buttons, zips and utensils.

School age

• Handwriting difficulty if the dominant hand is affected.
• Two-handed tasks are the main limit.
• Skin problems on the affected hand from unnoticed injuries.
• Surgery to improve grip or position is sometimes considered.

How is it diagnosed?

The diagnosis is clinical: a newborn with a working shoulder and elbow and a hand that does not work.

Serial examination by a specialist team, assessing each level separately on a standardized scale. What matters is the pattern of return over months. ²

Look for Horner syndrome deliberately. It is easy to miss in a sleeping newborn and it changes the assessment of severity. ¹

MRI of the brachial plexus, which is particularly relevant here, because lower root injuries are more often avulsions and MRI can show a root torn from the cord.

Chest X-ray if breathing is a concern, since the nerve to the diaphragm can be involved in extensive injuries.

Assessment of sensation, which matters for safety as the child grows.

Referral to a specialist brachial plexus center should happen early. Klumpke's palsy is uncommon enough that general services see few cases. ²

What is the treatment?

Daily range of motion, particularly of the fingers and wrist, taught by a therapist. Fingers that stiffen in a curled position are very hard to correct later. ²

Splinting is used more often here than in Erb's palsy, to hold the wrist and fingers in a usable position. Follow the therapist's specific instructions, because the wrong splint causes stiffness.

Therapy. occupational therapy for hand function, sensory work, and adaptation. Referral to early intervention is free and does not require anything beyond the diagnosis. ⁸

Nerve surgery. Considered where recovery stalls, generally between 3 and 9 months. Nerve transfers are often the approach for lower root injuries, because an avulsed root cannot be grafted back to the cord and a working nerve must be rerouted instead. ²

Sensory protection. A hand with reduced sensation gets injured without the child noticing. Teach checking the hand as a routine, as you would for any insensate limb.

Later surgery, including tendon transfers to restore grip.

What is the long-term outlook?

Klumpke's palsy generally has a less favorable outlook than Erb's palsy, for two reasons. Lower root injuries are more often severe, including avulsion, and the hand is functionally the most important part of the arm. ^{2 1}

Some babies recover well. Where Horner syndrome is present, the injury is more likely to be at the root, and the outlook is generally poorer.

Where hand function does not recover fully, children adapt a great deal, particularly if the unaffected hand becomes dominant. Nerve transfer surgery has improved what is achievable, which is a strong reason for early specialist referral.

Reduced sensation often persists even where movement improves, and it is a lifelong safety consideration.

What does daily life look like?

Splints, stretches and hand therapy.

Hand safety becomes a household routine: checking the hand after play, care around heat, and noticing marks the child did not report.

Two-handed tasks are the daily challenge. Adaptive tools help, and so does letting a child work out their own method rather than insisting on the standard one.

At school, handwriting, scissors, and anything requiring a stable grip need accommodation, and those belong in the written plan. ⁹

What does care cost over a lifetime?

No agency publishes a lifetime cost for Klumpke's palsy, and this site does not invent one.

Cost is driven by hand therapy over years, splints, nerve surgery in a substantial share of cases, and later reconstructive surgery.

If a legal case is filed, the relevant figure is a life care plan written for your child.

What can you do this week?

1. Ask whether Horner syndrome is present. Ask them to look specifically.
2. Get an early specialist referral. This pattern is uncommon and belongs in a center that sees it.
3. Get a therapy referral today and ask about splinting.
4. Ask whether an MRI is planned to look for root avulsion.
5. Ask about sensation and how to protect the hand.
6. Request the delivery records, including any shoulder dystocia note.
7. Film the hand weekly.

What should you ask each specialist?

Take these with you. Write the answers down in the moment, because you will not remember them later.

For the specialist team

• Is Horner syndrome present, and what does that tell you?
• Do you suspect avulsion, and will an MRI be done?
• What hand movements are you tracking, and by when?
• If surgery is needed, would it be grafting or nerve transfer?

For the hand therapist

• Should my baby be splinted, and for how many hours?
• Show me the finger and wrist stretches.
• How do I check the hand for injuries my child will not report?

You can also build a printable list with the question generator.