Inability to flex the wrist to the ulnar side and flex the distal knuckle of the little finger

Introduction Can not bend the wrist to the ulnar side and the distal knuckle of the flexor ring of the little finger is common in the ulnar nerve injury. Other symptoms include injury on the elbow, ulnar wrist flexor and ulnar flexor.

Cause

Causes of ulnar nerve injury: The ulnar nerve can be directly injured or fractured and dislocated. If the general anesthesia is not protected, the arm will hang over the operating table, which may cause paralysis due to compression. In the cervical rib or anterior scalene muscle. Syndrome, with the most damage to the ulnar nerve.

an examination

Related inspection

Small finger short flexor muscle strength test small finger on palm muscle strength test synovial fluid visual inspection

Physical examination is the main one. Perform a myoelectric examination if necessary. ,

Symptoms: the ulnar wrist flexor and the deep flexor ulnar side axillary, atrophy. Can not bend the wrist to the ulnar side and the distal knuckles of the little ring of the ring. When the finger is flat, the little finger can't climb the desktop. The muscles in the hands are extensive. Small fish, interosseous muscle and the 3rd and 4th sacral muscles, the adductor pollicis muscle and the medial head of the buckling short muscle. There is a significant depression between the small fish and the metacarpal. Ring fingers and little fingers have claw-shaped deformities. The claw-shaped malformation on the elbow is lighter, such as the distal injury of the deep flexor nerve. Because the deep flexor loses the antagonistic effect of the internal muscle, the claw-shaped deformity is obvious, that is, the metacarpophalangeal joint of the ringlet is overextended. The interphalangeal joint is flexed, and the interphalangeal joint cannot be extended while flexing the metacarpophalangeal joint. Due to the antagonistic action of the temporal sacral muscle, the middle finger of the food has no claw deformity or only slight deformity.

Differential diagnosis

Median nerve injury: the supracondylar fracture of the humerus can cause crush injury of the median nerve. After the fracture is reset, it can recover spontaneously. After the injury, the thumb, the middle finger and the middle finger can not be flexed. The thumb can not be abducted and the palm of the palm is paralyzed. Half finger feels the obstacle.

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