A birth brachial plexus injury is thought to be caused by an injury involving the child's brachial plexus during the delivery process. This injury results in incomplete sensory and / or motor function of the involved arm.
Per our published research, a brachial plexus injury was found to occur in 1.5 of every 1,000 live births.
Traumatic brachial plexus injuries may occur due to motor vehicle accidents, bike accidents, ATV accidents, sports, etc. Nerve injuries vary in severity from a mild stretch to the nerve root tearing away from the spinal cord.
Avulsion
The nerve is torn away from its attachment at the spinal cord; the most severe type. An eyelid droop suggests an avulsion of the lower brachial plexus (Horner's syndrome).
Rupture
The nerve is torn, but not at the spinal cord attachment.
Neuroma
Scar tissue has grown around the injury site, putting pressure on the injured nerve and preventing the nerve from sending signals to the muscles.
Neurapraxia (Ner-ra-PRAK-see-ah)
The nerve has been stretched and damaged but not torn.
The nerves of the brachial plexus originate in the neck, in the cervical spine. The nerves re-grow from the neck down the arm. This healing will occur at a rate of 1 mm per day or 1 inch per month.
A mixed or incomplete recovery may occur if the nerves do not fully reattach at their original motor and sensory targets.
Full recovery will occur only if sensory fibers reach their sensory end targets and motor fibers reach their muscle targets.
The ability to bend the elbow (biceps function) by the third month of life is an indicator of probable recovery. In addition to bicep function, active movement of the wrist in upward motion as well as thumb and fingers straightening is an even stronger indicator of excellent spontaneous improvement. Gentle range of motion exercises performed by parents, accompanied by repeated examinations by the physician, may be all that is necessary for patients with strong indicators of recovery.
About two-thirds of children with brachial plexus palsy get better on their own with minimal treatment. The remaining patients may have limitations related to their brachial plexus injury that are not resolving. Limitations may include incomplete range of motion with one or more movements, weak muscles, or decreased sensation (feeling) through the arm. It is for these children that the remainder of our treatment efforts are focused.
The timeframe of surgical repair is an important factor in recovery. Within 18 months, the muscles that have not already connected to nerves may have weakened to the point where it is no longer possible.
For avulsion and rupture injuries, there is no potential for full recovery unless surgical repair is done in a timely manner. For neuroma and neurapraxia injuries, the potential for improvement varies. Most patients with neurapraxia injuries have a fair prognosis of recovering spontaneously with a 90-100 percent return of function.
If surgery is needed, microsurgical nerve repair may be undertaken as early as 3 months. Primary nerve repair is typically completed between 3-6 months of age.
Procedures include:
Neurolysis
Removal of the constrictive scar tissue surrounding the nerve.
Neuroma Excision
When the neuroma is large it must be removed and the nerve is then reattached either with end-to-end techniques or with nerve grafts.
Nerve Grafting
When the gap between the nerve ends is so large that it is not possible to have a tension-free repair using the end-to-end technique, nerve grafting is used.
Neurotization
This is used generally in those cases where there is an avulsion. Donor nerves are used for the repair. The parts of the roots still attached to the spinal cord can be used as donors for avulsed nerves.
Isolated Nerve Transfers
- Isolated transfer may be completed up to 12-18 months of age
- A nearby healthy nerve is attached to the damaged nerve, closer to the target muscle
Additional procedures are available to improve the overall function of the affected limb.
Procedures include:
- Arthroscopic surgery and other minimally invasive techniques
- Tendon transfers
- Muscle transfers
- Shoulder reconstruction
- Rotational osteotomies
- Elbow reconstruction
- Botox
Nonsurgical management is also an important part of the treatment process.
Occupational and / or physical therapy is often recommended including range of motion, strengthening, neuromuscular electrical simulation, Kinesio Taping, joint mobilization, aquatic therapy and use of orthoses.
Because your child may not be able to move the affected arm alone, it is important for you to take an active part in keeping the joints limber.
A brachial plexus injury is a life-long condition. Management often focuses on preventing or minimizing deficits and maximizing the child's capabilities at home and in the community.
It is important to remember that your child is very adaptable. Be supportive and encouraging; focus on what your child can do. Positive reinforcement will help your child to develop a healthy sense of self-esteem and promote independence.
