hand nerve damage
Introduction
Introduction to hand nerve injury The innervation of the hand comes from the median nerve, the ulnar nerve and the phrenic nerve, walking between the finger flexor and the deep flexor. Hand nerve injury is usually caused by injury of median nerve, ulnar nerve and radial nerve. Cut injury, stab wound, hand trauma and forearm trauma can cause nerve damage in the hand. The main manifestation is that the hand feels gone. basic knowledge The proportion of illness: 0.012% Susceptible people: no special people Mode of infection: non-infectious Complications: joint dislocation
Cause
Cause of hand nerve injury
Cuts, stab wounds, hand wounds and forearm injuries can cause nerve damage in the hands.
Prevention
Hand nerve injury prevention
The prevention of traumatic hand nerve injury is mainly to strengthen labor protection, strengthen pre-job training, and enhance the work proficiency of workers. For compressional nerve injury, early treatment of primary disease and reduction of strain is the best preventive measure.
Complication
Hand nerve injury complications Complications joint dislocation
1. Fracture or dislocation with nerve injury is very common, mostly due to the fracture of the fracture end displacement nerve. In the case of fracture dislocation or manual reduction, a nerve pull injury can also occur, and a sharp bone fracture can sometimes pierce the nerve.
2. When the nerve is ischemic contracture, there are often some defects. If the nerve can be relieved in time, it is expected to recover partially or completely. If procrastination is too long, serious permanent paralysis can occur.
Symptom
Symptoms of hand nerve injury Common symptoms Thumbs and forefingers dysfunction dysfunction Little finger feels disappeared The index finger feels disappeared and can not bend the wrist to the ulnar side... The sensory disorder can not stretch the thumb
The muscles of the wrist and fingers flexing and stretching and the branches of their innervation are located at the proximal end of the forearm. The median nerve, the ulnar nerve, the radial nerve in the proximal and elbow of the forearm can cause flexion and extension dysfunction. When the hand is traumatized, the forearm is often involved. The distal end and the wrist, except for the sacral nerve, only cause the sensation of the tiger's mouth to decrease. In the middle, the ulnar nerve injury can cause internal muscle dysfunction and important sensory disturbance of the hand. The main manifestations are:
Median nerve
Thumb abductor muscle paralysis caused by thumb abduction dysfunction and thumb, index finger dysfunction dysfunction, palm sacral half, thumb, food, middle and ring finger squat side half palm face, thumb interphalangeal joint and food, middle and ring finger The lateral semi-proximal interphalangeal joint has a distant sensory disturbance, mainly characterized by the disappearance of the index finger.
Ulnar nerve
Interosseous muscle and sacral muscle paralysis caused by the ring, small finger claw-shaped hand deformity, that is, metacarpophalangeal joint overextension, interphalangeal joint flexion deformity; Froment sign caused by interosseous muscle and thumb muscle abscess, ie index finger force and thumb At the time of pointing, the proximal interphalangeal joint of the index finger was significantly flexed, the distal interphalangeal joint was overextended and the metacarpophalangeal joint was overextended, and the interphalangeal joint was flexed; and the ulnar side of the palm, the ulnar side of the ring and the volar side of the little finger, The sensory disturbance of the dorsal side of the ulnar side and the ulnar side of the hand is mainly manifested by the disappearance of the little finger.
3. phrenic nerve
The phrenic nerve has no movement branch below the wrist, and only shows the sensory disturbance of the proximal part of the proximal interphalangeal joint of the three sides of the back of the hand and the temporal side of the sac, mainly as the local sensation of the back of the tiger's mouth is reduced or disappeared.
4. Nerve injury in the palms and fingers
Frequent injury refers to the total nerve and the intrinsic nerve, which can cause sensory dysfunction on the adjacent side of the two fingers and sensory dysfunction on the side of the finger.
Examine
Examination of hand nerve injury
X-ray examination showed no positive findings.
Diagnosis
Diagnosis and diagnosis of hand nerve injury
The history of trauma can be clearly diagnosed based on the location of the injury, the area in which the hand feels lost, and the paralysis of each finger movement.
