Erb’s Palsy (Erb-Duchenne Palsy, Brachial plexus paralysis) is a paralysis of the arm caused by injury to the upper group of the arm’s main nerves (specifically, spinal roots C5-C7), almost always occurring during birth. Depending on the nature of the damage, the paralysis can either resolve on its own over a period of months, necessitate physical therapy or require surgery
• The most common cause of Erb’s palsy is dystocia, an abnormal or difficult childbirth or labour. For example, it can occur if the infant’s head and neck are pulled toward the side at the same time as the shoulders pass through the birth canal.
• The condition can also be caused by excessive pulling on the shoulders during a vertex delivery (head first).
• A similar injury may be observed in adults or following a traumatic fall on the side of the neck. It can also affect neonates affected by a clavicle fracture unrelated to dystocia
• The paralysis can be partial or complete; the damage to each nerve can range from bruising to tearing. The most commonly involved root is C5 (aka Erb’s point: the union of C5 & C6 roots) as this is mechanically, the furthest point from the force of traction, therefore, the first/most affected.
• The most commonly involved nerves are the suprascapular nerve, musculocutaneous nerve, and the axillary nerve.
• The injury often leaves patients with stunted growth in the affected arm with everything from the shoulder though to the fingertips smaller than the unaffected arm. This also leaves the patients with impaired muscular, nervous and circulatory development. The lack of muscular development leads to the arm being much weaker than the unaffected one, and less articulate, with many patients unable to lift the arm above shoulder height unaided, as well as leaving many with an elbow contracture.
• The lack of development to the circulatory system can leave the arm with almost no ability to regulate its temperature, which often proves problematic during winter months when it would need to be closely monitored to ensure that the temperature of the arm was not dropping too far below that of the rest of the body. However the damage to the circulatory system also leaves the arm with another problem. It reduces the healing ability of the skin, so that skin damage takes far longer than usual to heal, and infections in the arm can be quite common if cuts are not sterlised as soon as possible. This will often cause many problems for children since they often injure themselves in the course of their childhoods.
• The nervous damage is often the most problematic of the side effects to Erb’s Palsy, but it is also the most varying. There have been cases of patients who have lost complete sensory perception within the arm after procedures whereas they had full sensory perception before. The most common area for a loss of sensory perception (except where the arm faces a total loss) is that between the shoulder and the elbow since the nerves which provide information from that area to the brain are also those first damaged in the initial causative trauma.
• This toddler has brachial plexus birth palsy. It has caused a weakness of the right arm. The child is unable to raise the right arm overhead when reaching for an object.
• A pediatrician will usually be the one to make the diagnosis of a brachial plexus palsy injury, based on weakness of the arm and physical examination. A doctor may order an X-ray or other imaging study to learn whether there is any damage to the bones and joints of the neck and shoulder. The doctor may also do some tests to learn whether any nerve signals are present in the muscle of the upper arm. These tests may include an electromyogram (EMG) or a nerve conduction study (NCS).
• Because most newborns with brachial plexus birth palsy recover on their own, the baby will be re-examined frequently to see if the nerves are recovering. It may take up to two years for complete recovery. During this time, the parent will be taught how to do exercises with the baby to protect the soft joints and to keep the baby’s arm in good condition.
• Sometimes, the affected arm is noticeably smaller than the unaffected arm. This occurs, in part, because the arm is not used as much. This also occurs because normal nerves do have an effect on growth. Although the size difference is permanent, the arm will still grow until the child stops growing.
Some babies recover on their own; however, some may require specialist intervention.
Neonatal / pediatric neurosurgery is often required for avulsion fracture repair. Lesions may heal over time and function return. Physiotherapeutic care is often required to regain muscle usage.
Although range of motion is recovered in many children under one year in age, individuals who have not yet healed after this point will rarely gain full function in their arm and may develop arthritis.
The three most common treatments from Erb’s Palsy are: Nerve transfers (usually from the opposite leg), Sub Scapularis releases and Latissimus Dorsi Tendon Transfers.
The nerve transplants are usually performed on babies under the age of 9 months since the fast development of younger babies increases the effectiveness of the prodedure.They are not usually carried out on patients older than this because, although small babies nerves can recover to an extent, when the procedure is done on older infants, more harm than good is done and can result in nerve damage in the area where the nerves were taken from. Scarring can vary from faint scars along the lines of the neck to full “T” shapes across the whole shoulder depending on the training of the surgeon and the nature of the transplant.
Subscapularis releases, however, are not time limited. Since it is merely cutting a “Z” shape into the subscapularis muscle to provide stretch within the arm, it can be carried out at almost any age and can be carried out repeatedly on the same arm, however this will compromise the integrity on the muscle.
The Latissimus Dorsi Tendon Transfers involve cutting the Latissimus Dorsi in half horizontally in order to ‘pull’ part of the muscle around and attach it to the outside of the biceps. This procedure provides external rotation to varying degrees of success. A side effect of this may be increased sensitivity on the part of the biceps where the muscle will now lie since the Latissimus Dorsi has roughly twice the amount of nerve endings per square inch than other muscles.
PHYSIOLINE’S SPECIALISED PHYSIOTHERAPY HAS VITAL ROLE TO PLAY
At Physioline, all the members of the rehabilitation team work together so as to provide proper care and the therapy in order to:
• Relief pain
• Restore strength
• Muscle reeducation
• Restore sensation
• Prescription of orthoses
Visit Physioline for the Consultation and treatment