Ulnar nerve injury

Introduction to ulnar nerve injury On the wrist, the ulnar nerve is susceptible to cutting injuries. In the finger and palm, the nerve is easily cut or contused. The deep branch of the ulnar nerve is a branch of the movement, sometimes it can be stabbed or penetrated. At the elbow, the ruler is often affected by direct trauma or fracture dislocation, severe ulnar valgus deformity and ulnar nerve slip caused by ulnar nerve slip, also known as cubital tunnel syndrome or chronic ulnar neuritis. If you do not pay attention to protection during general anesthesia, your hand will hang on the side of the operating table, which may cause paralysis due to excessive compression. In the neck rib or anterior scalene syndrome, the ulnar nerve is the most damaged. basic knowledge The proportion of illness: 0.006% Susceptible people: no specific population Mode of infection: non-infectious complication:

Cause of ulnar nerve injury

(1) Causes of the disease

1. Crush injuries are the most common, causing direct violence, nerve damage is often severe, often accompanied by nerve defects.

2. Pulling injuries such as elbow internal humeral fractures, forearm ulna and radius fractures, and ulnar metacarpal fractures can directly cause ulnar nerve injury.

3. At the elbow, the ulnar nerve can be directly traumatized or combined for fracture dislocation.

4. Wrist and elbow cuts are more common.

5. If you do not pay attention to the protection during general anesthesia, the arm will hang over the side of the operating table, which may cause paralysis due to oppression.

6. In the cervical rib or anterior scalene muscle syndrome, the ulnar nerve is the most damaged.

Ulnar nerve injury prevention

There are no effective preventive measures for this disease. Pay attention to health, do a good job of safety protection, reduce and avoid the irritating and accidental damage of adverse factors, can play a certain preventive role. In addition, early detection, early diagnosis and early treatment are also the key to the prevention and treatment of this disease. In case of onset, active treatment should be actively treated to prevent complications.

Ulnar nerve injury complications Complication

If the symptoms are heavier, there may be a loss of sensation in the dominating area, a small intermuscular muscle, and anastomosis of the interosseous muscle.

Symptoms of ulnar nerve injury Common symptoms Thumb and index finger can not... Sensory disorder The little finger feels weak and can't bend the wrist to the ulnar side... Pathological nerve damage

(1) Sports

Injury on the elbow, the ulnar wrist flexor and the deep flexor ulnar side axillary, atrophy, can not bend the wrist to the ulnar side and the distal knuckle of the little finger of the flexor ring. When the finger is flat, the little finger can not climb the table, the internal muscle of the hand Widely sputum, small fish, interosseous muscle and the 3rd, 4th sacral muscles, the adductor pollicis muscle and the medial head of the buckling short muscles are all squat, there is obvious depression between the small fish and the metacarpal, the ring finger, the little finger has claw shape Malformation, the claw-shaped malformation on the elbow is lighter; if the deep flexor muscle supplies the distal injury, the deep flexor loses the antagonistic effect of the internal muscle, and the claw-shaped deformity is obvious, that is, the metacarpophalangeal joint of the ringlet is overextended. Interphalangeal joint flexion, can not extend the interphalangeal joint while flexing the metacarpophalangeal joint, due to the antagonistic effect of the temporal biceps muscle, the middle finger of the food has no claw deformity or only slight deformity, each finger can not adduct abduction, The paper test was positive, and the thumb and forefinger could not form an intact "O" shape on the palm. The two fingers showed weakness in the pinch test. It was due to the internal traction of the flexor tendon and could not stabilize the thumb and knuckle joint. The little finger and the thumb were pinched. Obstruction, due to intramuscular tendon, the hand grip strength is reduced by about 50% and lost Hand flexibility.

(b) feeling

On the ulnar side of the hand, all the little fingers, the feeling of the ring finger side disappeared.

Ulnar nerve injury examination

No relevant laboratory tests.

Physical examination is the main method. When necessary, the electromyogram is examined, and the electromyogram is used to determine the nerve damage and degree.

Diagnosis and diagnosis of ulnar nerve injury

Median nerve injury: supracondylar fracture of the humerus can cause compression injury of the median nerve. After the reduction of the fracture, the thumb can often recover after the injury. The middle finger can not flex and the thumb can not be abducted and the palm of the hand is half-finger. .

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