Inferior radioulnar joint dislocation

Introduction to the lower ankle joint dislocation The function of the lower ankle joint is to stabilize the rotation of the humerus at the distal end of the ulna. The main stabilizing factors are: the ulnar collateral ligament, which is attached to the tip of the ulnar styloid process, ending at the pea bone and the triangular bone; the triangular cartilage disc is attached. The ulnar styloid base to the ulnar edge and the humerus concave; the ulnar and posterior ulnar ligaments are connected to the joint capsule; the anterior muscle; the distal surface of the humerus and the ulna and interosseous membrane. Dislocation of the lower ankle joint can be associated with Colles fractures, Smith fractures and Galazzi fractures, and many cases are single. Dislocation of the lower ankle joint is often missed by doctors with insufficient clinical experience. Therefore, the diagnosis of dislocation must emphasize clinical performance, and should also use bilateral contrast to find and solve difficult problems. basic knowledge The proportion of illness: 0.001% Susceptible people: no specific population Mode of infection: non-infectious Complications: fracture

Causes of dislocation of the lower ankle joint

(1) Causes of the disease

A sprain in the wrist, or lifting a heavy object, can cause the wrist to be deflected, and the dorsiflexion or rotational stress can cause such damage.

(two) pathogenesis

Falling down on the hand, the sprain of the wrist or suddenly lifting the weight, so that the wrist can be deflected, the dorsiflexion or the rotation of the stress can cause such damage. When the dorsal ligament of the ruler is broken, the ulnar will occur during the pronation process. Subluxation of the small head to the dorsal side; when the ulnar ligament of the ulnar ulnar ruptures, the subluxation of the ulnar head to the volar side occurs in the post-spin process, such as the absence of a triangular fibrocartilage disc or a ulnar styloid fracture. Complete ulnar dislocation occurs, in other words, the rupture of the triangular fibrocartilage disc or the ulnar styloid fracture when the ulnar and ankle joint is completely dislocated is one of the two. The tear of the triangular cartilage disc needs to be at the center, horizontal or elongated. The ulnar styloid fracture often occurs at the base and is caused by the traction of the ulnar collateral ligament of the triangular fibrocartilage disc and the wrist.

Lower ankle dislocation prevention

Fully warm-up activities before exercise, improve the excitability, responsiveness and resistance of muscle tissue, and gradually increase the degree of confrontation, which is helpful to reduce joint dislocation.

Lower ankle joint dislocation complications Complications

Often complicated with ulnar styloid fractures and triangular cartilage injuries.

Lower ankle joint dislocation symptoms Common symptoms Wrist joint to the ulnar side... Wrist swelling and tender wrist pain

The following dislocation of the ulnar ulnar joint is the most common. At this time, it can be seen that the ulnar small head protrudes to the dorsal side during the forearm pronation, and automatically resets after the rotation, local swelling and tenderness, passive movement of the ulnar and ankle joints, and the normal side can be perceived. Relaxed, accompanied by pain, sometimes flared.

Mainly for the local symptoms of the lower ankle joint, the performance is:

1. Wrist pain is limited to the lower ankle joint and the ulnar styloid process, which is exacerbated by rotation and ulnar deviation.

2. The elastic bulge is contrasted with the healthy side. It can be seen that the ulnar small head is raised to the back side or the palm side, and the pressure is reset, and the hand is moved back to the original position.

3. Limited mobility due to pain in the affected side of the forearm rotation and ulnar deviation is significantly limited, especially with triangular cartilage damage.

4. Swelling is generally lighter.

Examination of dislocation of the lower ankle joint

X-ray examination should be compared on both sides for easy observation and judgment.

Diagnosis and diagnosis of lower ankle joint dislocation

Wrist pain

Limited to the lower ankle joint and the ulnar styloid process, the rotation and the ulnar deviation are exacerbated.

2. Elastic bulge

Compared with the healthy side, it can be seen that the ulnar small head is raised to the dorsal or volar side, and the pressure is reset, and the hand is lifted back to the original position.

3. Limited activity

Because the pain of the affected side of the forearm rotation and ulnar deviation is significantly limited, especially with triangular cartilage damage.

4. Swelling

Generally lighter.

5.X-ray film

It should be compared on both sides for easy observation and judgment.

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