What Is Ulnar Nerve Damage?

The ulnar nerve is easily damaged in the wrist and elbow. After ulnar nerve injury, the ulnar side of the palm, all the little fingers, and the ulnar side of the ring fingers disappeared. The deep branch of the ulnar nerve is a motor branch, sometimes stabbed or penetrating. In the wrist, the ulnar nerve is vulnerable to lacerations. In the fingers and palm, the superficial branch of the ulnar nerve is also vulnerable to lacerations. Ulnar nerve injury is a bone and trauma disease.

Basic Information

English name

Injury of radid nerve

Visiting department

Neurology, orthopedics

Common locations

Wrist and elbow

Common causes

Wrist and elbow injuries due to stab wounds or penetrating cuts

Common symptoms

Interosseous and vermiform muscles have limited fine hand movements, atrophy of the intramuscular muscles, ring and end of little finger flexion dysfunction, etc.

Causes of ulnar nerve injury

The ulnar nerve comes from the medial bundle of the brachial plexus, descending along the medial side of the brachial artery, gradually turning to the dorsal side in the middle of the upper arm, passing through the ulnar nerve groove on the posterior side of the medial superior humerus, and penetrating between the ulnar carpi flexor ulnar head and the humeral head. The ulnar carpi flexor then enters the palmar side of the forearm between the ulnar carpi flexor and the deep finger flexor, and issues a branch to the ulnar half of the deep flexor flexor, and then accompanies the ulnar artery, deep in the radial flexor of the ulnar carpi flexor. From the face to the wrist, issue a dorsal branch of the hand about 5cm above the wrist to the skin on the ulnar side of the back of the hand. The main trunk is divided into deep and shallow branches through the carpal ulnar tube between the pea bone and the hook bone. The deep branch penetrates the small fish muscles into the deep part of the palm and dominates the small fish muscles, all interosseous muscles, and 3,4 vermiform muscles. Adductor hallucis and flexor hallucis medial head. Superficial branch to the ulnar side of the palm and one and a half finger skin on the ulnar side. Injury to the ulnar nerve results in corresponding dysfunction.

Clinical manifestations of ulnar nerve injury

Wrist injuries are mainly manifested by interosseous muscles, vermiform muscles, hallux adductor paralysis, little finger claw hand deformities, finger adduction, abduction disorders and Froment sign, and ulnar and ulnar halves of the hand Finger dysfunction, especially the pinky sensation disappeared, fine hand movements were limited, and internal hand muscle atrophy. In addition to the above manifestations of the elbow injury, there is also a ring and little finger flexion dysfunction.

Ulnar nerve injury examination

1. Special inspection: Froment sign.

2. Electromyography.

Ulnar nerve injury treatment

After the ulnar nerve was repaired, the internal muscle function of the hand was poorly restored, especially the high injury. In addition to repairing the nerves as soon as possible, the ulnar nerve motor and sensory nerves in the wrist have been divided into bundles, and nerve bundle sutures can be used to improve the surgical effect. Late functional reconstruction is mainly to correct claw-shaped hand deformities.