Congenital distal radioulnar joint subluxation

Introduction to congenital distal ankle joint subluxation Congenital Madelung malformation (Maderon malformation) is a congenital distal ulnar joint subluxation deformity caused by dysplasia of the distal ulnar and volar epiphyses. Some people call it a congenital wrist subluxation, a defect in the distal humerus and a shorter ulnar side than the lateral aspect. basic knowledge The proportion of illness: 0.001% Susceptible people: no specific population Mode of infection: non-infectious Complications: joint pain

Congenital distal radius and ankle joint subluxation cause

(1) Causes of the disease

Although the vast majority of this deformed patient does not show significant performance until puberty, it is still considered a congenital anomaly.

(two) pathogenesis

The disease is caused by the growth of the epiphysis of the distal radius of the humerus, mainly the medial 1/3 of the epiphysis. Due to the slow growth, the premature closure causes the tibia to shorten, causing the lower ankle joint to dislocate to the volar, the hand to the volar and The ulnar side is skewed, because the ulna still grows in a straight line, the lower end of the ulna is subcutaneous, and the lower end of the tibia is relatively shortened.

Congenital distal ulnar and ankle subluxation prevention

There are no effective preventive measures in this life.

Congenital distal ulnar and ankle subluxation complications Complications, joint pain

Joint deformity.

Congenital distal radius and ankle joint subluxation symptoms common symptoms joint deformity

1. Clinical manifestations of non-traumatic disorder, more common in women, manifested symptoms during development, with increasing age and deformity, local pain will also be aggravated, the typical malformation is the ulnar styloid process on the dorsal side of the wrist and ruler The side is in the same plane or longer as the styloid process of the humerus. The wrist joint is displaced to the volar side, the temporal side is displaced, and the activity is limited, especially the dorsiflexion and the ulnar deviation. The rotation function of the forearm may be limited to varying degrees, but The function of the supination is limited.

2. Clinical type

(1) Typical malformation: the distal joint of the humerus is inclined 80° toward the volar side and 90° to the ulnar side. The carpal bone is arranged in a peak shape, the apex is the lunate bone, and the entire carpal bone is moved to the ulnar side.

(2) Anti-abnormality: the distal end of the humerus is inclined to the dorsal side, and the distal end of the ulna is dislocated to the anterior end of the humerus

Congenital distal ulnar and ankle subluxation

On the X-ray film, the ulnar styloid process is lower than the sacral styloid process, and the entire carpal bone is moved to the ulnar side. The arranged domes are peak-shaped, the top is the lunate bone, and the whole row of carpal bones is displaced to the ulnar side.

Diagnosis and diagnosis of congenital distal ulnar and ankle subluxation

Diagnosis can be established based on clinical manifestations and X-ray examination.

Severe compression fractures of the distal radius can cause shortening of the humerus, palmar deformity, and ulnar styloid process, but the two are not difficult to identify.

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