Limited forearm supination
Introduction
Introduction Limited function of the forearm supination is a clinical diagnosis of distal radius fractures. The vast majority of the wrist is injured in the back of the wrist. The axial force is mostly transmitted through the central column and the lateral column through the scaphoid and lunate bone to the distal end of the humerus. When the distal radius fracture is fixed, the affected limb should be kept in the supination. 15° or neutral position. Pre-rotation fixation often limits the function of the forearm to be rotated, and should be corrected in time to return to the supination position, otherwise it will affect the rotation function of the forearm. The disease is caused by indirect external force. When it falls, the elbow is straight, the forearm is pre-rotated, the wrist is extended, and when the palm is on the ground, the stress acts on the distal end of the humerus and fracture occurs.
Cause
Cause
The disease is caused by indirect external force. When falling, the elbows are straight, the forearms are in front of the fore, the wrists are stretched back, and the palms are on the ground. Stress occurs at the distal end of the humerus and fractures occur.
The majority of patients with distal radius fractures are injured in the wrist. The axial force is mostly transmitted through the central column and the lateral column through the scaphoid and lunate bone to the distal end of the humerus. Between the lunate bones, the force is mainly concentrated on the scaphoid ligament, which is easy to cause the scaphoid ligament injury and the separation of the boat and the moon. The distal joint surface of the humerus tends to be shattered. Because the palmar flexion is not conducive to the repair of the dorsal structure, the ulnar deviation increases the separation of the scaphoid and makes the diaphragmatic muscle tense, which is easy to cause the temporal displacement, which is not conducive to improving the instability of the wrist joint.
Examine
an examination
Related inspection
Spinal muscle strength test, supinator muscle strength test, bone and joint and soft tissue CT examination
The auxiliary examination method of this disease is mainly X-ray examination, X-ray film shows typical displacement, there are several points:
1. The distal radius fracture block is displaced to the dorsal side.
2. The distal radius fracture block is displaced to the temporal side.
3. The humerus is shortened, and the dorsal cortical bone is embedded or fractured.
4. The fracture is angled to the volar side.
5. The distal radius of the humerus is supinated.
In addition, the ulnar head subluxation or total dislocation was shown, and the distal radius fracture was displaced to the temporal side to indicate the triangular cartilage edge tear. Often combined with ulnar styloid avulsion fractures. The palm tilt angle and the ulnar angle are reduced or negative.
Diagnosis
Differential diagnosis
The forearm has a pronation deformity: the forearm has a pronation deformity, and the pronation is a clinical manifestation of the radial nerve injury during exercise. The phrenic nerve is close to the diaphysis in the lower third of the humerus, where the phrenic nerve is vulnerable to injury.
Forearm rotation pain: humeral neck fracture pain: obvious pain, tenderness and forearm rotation pain at the small head of the humerus.
Avulsion fracture: The internal humeral fracture of the humerus is common in sports injuries such as falling or throwing on the ground. When the fall, the forearm extends and abducts, and when the forearm flexor contractes fiercely, the upper jaw of the humerus is pulled by the flexor muscles to cause avulsion fracture.
The auxiliary examination method of this disease is mainly X-ray examination, X-ray film shows typical displacement, there are several points:
1. The distal radius fracture block is displaced to the dorsal side.
2. The distal radius fracture block is displaced to the temporal side.
3. The humerus is shortened, and the dorsal cortical bone is embedded or fractured.
4. The fracture is angled to the volar side.
5. The distal radius of the humerus is supinated.
In addition, the ulnar head subluxation or total dislocation was shown, and the distal radius fracture was displaced to the temporal side to indicate the triangular cartilage edge tear. Often combined with ulnar styloid avulsion fractures. The palm tilt angle and the ulnar angle are reduced or negative.
