Brachial Plexus Injury
A network of nerves that conveys signals from the spine to arms, hands and shoulders is known as brachial plexus. Brachial refers to an arm and a network of nerves is indicated as plexus. Damage to these nerves causes brachial plexus injuries. A paralyzed arm, lack of muscle control in the arm, wrist or hand are some of the symptoms of brachial plexus injuries. Along with any of these symptoms, there is lack of feeling or sensation in the arm or hand.
Brachial plexus injuries commonly occur during birth but a possibility of this injury occurring at any time cannot be ruled out. When this injury happens during birth, the brachial plexus nerves stretch or tear as a result of an impact of the shoulders of the baby during the birth process. This injury is also known as Erb's Palsy when newborn is affected by it. A more serious condition called global palsy may occur when the injury involves both the upper and lower nerves. A difficult delivery when the baby is very large or if there is a breech or a protracted labor, pose the problem of brachial plexus injury. Brachial Plexus injuries are classified into four types:
Occupational or physical therapy is available for treating brachial plexus injuries and some cases may need surgery. Recovery is not possible for avulsion and rupture injuries unless surgery is done well in time to reconnect the nerves. The potential for recovery differs from patient to patient, if the injury is either neuroma or neuropraxia. Recovery is spontaneous for patients who suffer from neuropraxia.
A new born affected with this injury will not be able to move the arm and will keep its arm stiff at its side. A more severe injury in an infant is indicated by a droopy eyelid on the affected side. The doctor will look for any damage to the bones and joints of the shoulder and the neck by ordering a x-ray or MRI. EMG is conducted to determine the presence of nerve signals in the muscles of the upper arm.
Since recovery is possible without surgery, most infants affected by Erb's palsy or brachial plexus injury will be examined after a month again. This is to confirm the extent of recovery of the nerves. The doctor will repeat this examination after two more months. For complete recovery, it may take even up to two years. The doctor may suggest a range of motion exercises that are most important to keep the infant's joints from getting stiff.
Neurotmesis etymology: Neurotmesis refers to most serious and severe nerve injury. Neurotmesis is brachial plexus injury. These brachial plexus injuries can occur in live births. The type of injury to the brachial plexus and the stretch damage will determine where the injury takes place. Various types of injuries can occur once the nerve rootlets form mixed nerve root. In some instances, the extent of the nerve damage may not be fully apparent but complete loss of motor, sensory and autonomic functions occurs. This type of complete rupture of the brachial plexus is called Neurotmesis. Neurotmesis is part of Seddon's classification scheme used to classify nerve damage. Seddon classified the nerve injury based on the extent of damage to the nerves on the basis of structural changes in cut nerves. The Seddon classification divides nerve injuries into three types namely:
Neurotmesis: Complete anatomic division of the nerve fibers with obvious discontinuity of the nerve sheath.
Axonotmesis: Microscopic division of nerve fibers without obvious discontinuity of nerve sheath.
Neuropraxia: There is injury without any anatomical discontinuity but resulting in functional disruption or nerve concussion. This is short term or sometimes lasts months with severe compression.
Neuropraxia Symptoms : Nerve Damage Symptoms: Common symptoms of Neurotmesis include loss of sensation and change in taste, expression and speech. There might be emotional and psychological disturbances. In the final stages, there could be a complete loss of motor, sensory and autonomic functions.
Diagnosis of Nerve Injury: There are many ways to diagnose the extent of the nerve injury. One of the common ways is Nerve conduction Velocity Test which tests the speed and strength of a signal being transmitted by nerve cells. Testing these factors can reveal the nature of nerve injury, such as damage to nerve cells or to the protective myelin sheath (protective coating on axons).
The test Electroneurography (EneG) which is also known as nerve conduction study or usually as a Nerve Conduction Velocity test(NCV) will help determine the nerve damage and further explore the choice of treatment.
Other than Peripheral nerve injuries, NCV is also helpful for the diagnosis of the following conditions:
Guillain Barré syndrome
Herniated disc disease
Charcot Marie Tooth disease
Special tests for assessment of Neurotmesis include electromyography, Strength duration curve, nerve conduction study and thermography. EMG test will be able to determine the presence, location and access the extent of diseases that caused the damage to the nerves and muscles. In some cases, a nerve biopsy may be needed where a small minute portion of the damaged nerve is surgically removed and analyzed.
Prognosis: Recovery from trauma is dependent on the age of the patient, type of injury and degree of injury. Without surgical intervention and repair this injury has very poor prognosis. Even with surgical repair, there could be significant loss of motor and sensory neurons which are responsible for normal conduction.
Ulnar nerve is a nerve that originates in the brachial plexus and travels downwards to the arm. It extends from shoulder to the wrist and branches into little finger and ring finger. It is responsible for sending sensation to the inner forearm, a portion of the palm near the little finger and half of the ring finger. Any damage caused to this nerve leads to a condition called ulnar neuropathy.
One of the most common causes of repeated neuropathy is compression. This is the only nerve in the entire body that is not well protected by bones and muscles and hence more prone to damage. The ulnar nerve can be constricted and get entrapped as it passes through the elbow and wrist. It can even be entrapped under the collarbone or at the point of origination near spinal cord. However, the ulnar nerve is commonly entrapped at the elbow and the condition is known as Cubital Tunnel Syndrome. It is also referred to as ulnar nerve compression, Ulnar nerve palsy or ulnar nerve entrapment. The other names for ulnar nerve condition are Bicycler's neuropathy and Guyon's canal syndrome.
Patients with ulnar nerve compression at any level have altered sensation in the little and ring fingers. Indeed, in most patients, sensory loss is the first symptom to be reported. As the condition progresses, they may also notice clumsiness in the hand, as the ulnar nerve is the principal motor supply to the intrinsic muscles of the hand. In wellâestablished cases, there may be marked wasting of the small muscles of the hand and the ulnarâsided muscles of the forearm. Typical symptoms of this condition involve numbness and reduced sensation in the fingers. Clumsiness or weakness of the hands might be noticed. There is loss of grip and reduced coordination between fingers.
Direct injury to the nerve or pressure are primary causes for this condition. In severe cases of ulnar nerve compression, wasting of the muscles of the hand and forearm may be detected. Any injury such as fracture, dislocation or severe twisting of elbow can affect the the ulnar nerve. Pressure on the nerve caused by swelling or injury of adjacent tissue can also lead to ulnar nerve compression.
A through physical examination is conducted and history and symptoms of the patient are noted. Doctor may ask the patient to perform certain tasks with the hands to understand if the pain is arising due to ulnar nerve entrapment. Ultrasonography and/or MRI of the ulnar nerve in conjunction with nerve conduction study to assess the functioning of the ulnar nerve, can help identify the location at which it is being compressed.
Treatment of Ulnar Nerve Compression
Ulnar neuropathy is most often treatable through a conservative approach. Pain relievers and anti-inflammatory drugs are prescribed to address the pain. Steroid injections, though highly effective, are avoided as they can damage the nerve when injected in that region.
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Bibliography / Reference
Collection of Pages - Last revised Date: April 9, 2020