Ulnar nerve entrapment

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Ulnar nerve entrapment Classification and external resources
ICD-10	G56.2
ICD-9	354.2

Ulnar nerve entrapment is a condition where the ulnar nerve becomes trapped or pinched due to some physiological abnormalities.

Symptoms

Commonly, this causes pain, numbness, or paralysis of the ring and little fingers which may extend up the arm. This can be differentiated from carpal tunnel syndrome and radial nerve entrapment in that different fingers are involved.

Causes

The ulnar nerve passes through many tunnels and outlets which could cause the nerve to be pinched. Some causes or origins noted could be:^[1]

• Problems originating at the neck (thoracic outlet syndrome, disease of the cervical spine)
• Brachial plexus abnormalities
• Elbow abnormalities (fractures, growth plate injuries, cubital tunnel problems, improper use)
• Wrist abnormalities (fractures, Guyon canal problems)
• Artery aneurysms or thrombosis
• Infections, tumors, diabetes, hypothyroidism, rheumatism, and alcoholism

Cubital Tunnel Syndrome

Cubital tunnel syndrome occurs when the Ulnar nerve is obstructed during its path along the outer edge of the elbow. This compression of the nerve often leads to a tingling or 'pins and needles' sensation in the little and ring fingers (as opposed to Carpal Tunnel Syndrome which affects the first, second and third fingers). Most cases will be minor and tend to come and go with time. Common causes are sleeping with the arm folded up, so the hand is at the persons neck. People frequently wake up with in these cases with tingling in the fingers, because the nerve has been pinched or squeezed. Treatment of these types of causes are easy to remedy and can involve simply altering sleeping positions to avoid aggravating the elbow area. In more extreme cases however where tingling is persistent, surgery is an option to move the nerve away from the area.^[1]

References

External References

• AAOS:Ulnar Nerve Entrapment

v • d • e Nervous system pathology, primarily PNS (G50-G99, 350-359)
Nerve, nerve root and plexus disorders (neuropathy, radiculopathy, plexopathy)	cranial nerve: V (Trigeminal neuralgia) - VII (Facial nerve paralysis, Bell's palsy, Melkersson-Rosenthal syndrome, Central seven) - XI (Accessory nerve disorder) nerve root and plexus: Brachial plexus lesion - Thoracic outlet syndrome - Phantom limb mononeuropathy: upper limb (Carpal tunnel syndrome, Ulnar nerve entrapment, Radial neuropathy) - Causalgia - lower limb (Meralgia paraesthetica, Tarsal tunnel syndrome, Morton's neuroma) - Mononeuritis multiplex
Polyneuropathies and other disorders of the PNS	hereditary and idiopathic (Charcot-Marie-Tooth disease, Dejerine Sottas syndrome, Refsum's disease, Morvan's syndrome) Guillain-Barré syndrome - Alcoholic polyneuropathy
Diseases of myoneural junction	autoimmune: Myasthenia gravis - Lambert-Eaton myasthenic syndrome
Diseases of muscle (myopathy)	Muscular dystrophy myotonic (Myotonic dystrophy, Myotonia congenita, Thomsen disease, Neuromyotonia, Paramyotonia congenita) congenital myopathy (Centronuclear myopathy, Nemaline myopathy, Central core disease) Mitochondrial myopathy periodic paralysis: Hypokalemic - Hyperkalemic
Autonomic	Familial dysautonomia - Horner's syndrome - Multiple system atrophy (Shy-Drager syndrome, Olivopontocerebellar atrophy)