congenital absence of ulna

Introduction

Introduction to congenital ulnar absence This disease is a rare congenital malformation, also known as the ulnar rod-shaped hand, which is rarer than the humeral rod-shaped hand. Mostly unilateral onset, mostly on the right side, more male patients than female. The thumb and index finger existed, and the activity function was good, but the ulnar side column was absent. The affected forearm is small, short and tilted to the ulnar side, the humeral head is dislocated, and the forearm rotation function is limited, but the wrist and elbow joint functions are still good. Patients may have a lack of carpal bone at the same time, usually pea bone, hook bone, large angle bone and head bone, and sometimes the 4th and 5th metacarpals are also absent. basic knowledge Sickness ratio: 0.0001% Susceptible people: seen in children Mode of infection: non-infectious Complications: fracture

Cause

Congenital ulnar absence

(1) Causes of the disease

The cause of the disease is due to the trunk of the embryonic limb bud, caused by the second, third and fourth ray growth inhibition, the complete absence of the ulna is very rare, and partial deficiency is more common.

(two) pathogenesis

No relevant information.

Prevention

Congenital ulnar absence prevention

1, usually pay attention to living habits, early detection and early treatment, should be more fresh fruits and vegetables, such as figs, lychee, walnuts, melons, olives, almonds and so on.
2. During pregnancy, the mother should pay attention to the individual's nutritional status, strengthen nutrition, and do prenatal examination on time to find early.
3, to maintain a happy spirit, depression or excessive tension and fatigue, usually insist on eating low-fat foods, such as lean meat and low-fat dairy products.

Complication

Congenital ulnar lack of complications Complications

Due to the lack of ulna, the weight of the upper limb is only supported by the humerus, which increases the pressure of the humerus, which is easy to cause fracture of the humerus. The wrist is swollen and tender, and the movement of the hands and wrists is limited. May cause median nerve injury: delayed extension of the tendon tendon rupture; fracture non-healing. Infection may also occur, mainly due to long exposure time after wound injury, incomplete debridement and severe soft tissue injury.

Symptom

Congenital ulnar absence symptoms Common symptoms Forearm small clubfoot

Most of the disease is unilateral, mostly on the right side, more male than female, the thumb and index finger are present, the activity is good, but the ulnar side is missing, the forearm is small, short and tilted to the ulnar side. Dislocation of the humeral head, limited rotation of the forearm, but the wrist and elbow joint function is still good, the patient can have the absence of the wrist bone, usually pea bone, hook bone, most angle bone and head bone, sometimes the 4th and 5th metacarpals also have Absence, the humerus protrudes outward from the arch, and it grows more obviously with children. About 20% of the children have a deformity of the fingers, and other common malformations of the whole body are lack of humerus, horseshoes, and spina bifida.

Examine

Congenital ulnar lack of examination

On the X-ray film, the ulna is only a slender cartilage fiber with a substantial shadow. Compared with the humerus, the humeral head is dislocated, the normal curvature of the humerus is increased, and it protrudes to the outside. The ulnar side of the wrist can disappear or Blended into one piece.

Diagnosis

Diagnosis and diagnosis of congenital ulnar deficiency

According to clinical manifestations, it is not difficult to diagnose with malformation and X-ray features.

Clinically, it should be differentiated from ulnar developmental disorders caused by ulnar osteomyelitis in infants. The latter has a history of fever and local redness. Limited ulnar development can cause dislocation of the humeral head, but no other malformations.

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