Brachial Plexus and Erb's Palsy

The brachial plexus is the network of nerves running from the spinal cord in the neck, through the shoulder, and down the arm. It carries everything: movement and sensation from shoulder to fingertips.

A birth-related brachial plexus injury is stretching, tearing or avulsion of some of those nerve roots, producing weakness or paralysis in the affected arm. The newborn presentation is usually unmistakable — one arm not moving, held against the body, with the classic posture that gives the condition its older name.

Injury severity runs a spectrum. A neurapraxia is a stretch injury with the nerve intact, and it recovers. A rupture is a tear in the nerve outside the spinal cord, which may need surgery. An avulsion is the root torn from the spinal cord itself, which does not recover spontaneously and cannot be directly repaired.

Which of those a child has is not knowable at birth, and this is the fact that shapes everything that follows.

Erb's palsy involves the upper roots and is by far the most common. The shoulder and upper arm are affected; hand function is typically preserved. It has the best prognosis.

Klumpke's palsy involves the lower roots, affecting the hand and wrist. It is much less common and carries a poorer outlook.

Total plexus involvement affects the whole arm and is the most serious.

An accompanying Horner's syndrome — a drooping eyelid and constricted pupil on the affected side — is clinically significant beyond its appearance, because it suggests injury at the level of the lower roots close to the spinal cord and is associated with avulsion.

These distinctions matter to a family for a practical reason rather than a technical one: they are the earliest available signal of which children need specialist referral quickly, and referral timing is one of the things that is examinable later.

The intuitive account of these injuries — the shoulder was stuck, the doctor pulled too hard, the nerves tore — is sometimes what happened. It is not what happened in every case, and the medical literature is clear enough on this that a plaintiff's case built on the intuition alone will not survive.

Brachial plexus injuries are documented in deliveries with no diagnosed shoulder dystocia. They are documented in cesarean deliveries. They are documented in deliveries where the clinician applied no more than routine traction. The proposed mechanisms include maternal propulsive forces acting on a shoulder against the pubic bone or sacral promontory, and intrauterine factors preceding delivery entirely.

There is a further complication that arises specifically in Illinois cases involving a posterior arm injury — an injury to the arm that was not against the pubic bone is difficult to attribute to the traction applied to free the anterior shoulder, and defense experts use that asymmetry.

None of this means these cases cannot be won. It means the injury is the beginning of the inquiry rather than the conclusion of it, and a family should be told that at the first meeting rather than the last.

The record of the delivery, examined against what the guidance asks for.

Was a shoulder dystocia diagnosed, and was the required operative note completed? ACOG's guidance calls for the event and the details used to resolve it to be entered as an operative report immediately after delivery. A note that records the maneuvers, their order, the personnel present, the head-to-body interval and the fetal position is the expected state. Its absence is a departure independent of what occurred.

Does the record describe what was done rather than only what happened? A sequence showing McRoberts, then suprapubic pressure, then delivery of the posterior arm describes a systematic approach. A record showing several minutes of downward traction and nothing else describes a different event.

Was the affected arm the anterior shoulder? The mechanical account has to hold together.

And was there a documented risk discussion where strong prenatal risk factors existed — a prior shoulder dystocia in particular, which is one of the few genuinely predictive factors.

Most brachial plexus injuries recover substantially in the first months. Families are told this at discharge and for most of them it is correct.

For those where recovery stalls, nerve reconstruction surgery is available and the referral timing matters. Specialist centers generally assess for surgery within the first several months of life, because the results of reconstruction deteriorate as the interval lengthens and as the target muscles change with prolonged denervation.

This creates a situation worth stating plainly to families: the period during which everyone is reasonably waiting to see whether the arm recovers overlaps with the period in which a surgical decision has to be made. A child who is still not moving the arm at three months should be under specialist review, not still being reassured.

Whether a delayed referral is itself actionable is a separate question from the delivery. It is, however, one more reason the records are worth gathering early — the referral trail is part of the same file.

A residual brachial plexus injury is not a catastrophic-care case in the way cerebral palsy is, and the claim is shaped differently.

What it involves: therapy over years, often surgery and sometimes several procedures, adaptive equipment, and — the part most often underestimated — the functional consequences of a single working arm across a working life. Limb length discrepancy and shoulder deformity develop over time in more severe cases. The loss is as much occupational as medical.

Because the extent is not known for months or years and the delivery record is the evidence, these cases have the same structural problem as the others on this site: the point at which the family knows what happened to their child is well after the point at which the proof was easiest to secure.

Requesting the complete delivery record, including the operative note, costs nothing and forecloses nothing.