Carpal spear deformity

Introduction The distal end of the spur-like deformity fracture is displaced to the temporal side with the hand, and the axis of the middle finger is not in the same plane as the axis of the tibia. Mostly caused by indirect violence. Most of them fall flat, the palms of the hands and the wrists are in the extension of the back and the inner rotation of the forearms, so that the violence is concentrated on the cancellous bone of the distal radius and causes fracture. In this state, the distal end of the fracture must have a displacement to the dorsal and temporal sides. At this time, the ulnar styloid process may be accompanied by a fracture, and the triangular fibrocartilage disc may also tear.

Cause

The cause of the stab-shaped deformity of the wrist gun:

(1) Causes of the disease

Mostly caused by indirect violence.

(two) pathogenesis

Most of them fall flat, the palms of the hands and the wrists are in the extension of the back and the inner rotation of the forearms, so that the violence is concentrated on the cancellous bone of the distal radius and causes fracture. In this state, the distal end of the fracture must have a displacement to the dorsal and temporal sides. At this time, the ulnar styloid process may be accompanied by a fracture, and the triangular fibrocartilage disc may also tear.

an examination

Related inspection

Bone and joint plains of the extremities, flexion wrist test, extensional wrist test, blood routine limb fluoroscopy

Diagnosis of a stab-shaped deformity of a wrist gun:

X-ray photography, the humerus is transversely cut at about 3.0cm from the articular surface, and the distal segment of the anterior segment is displaced to the temporal side. It can be inserted into the proximal segment and the distance between the lower ankle joint is increased (separated). The lower end of the humerus is inclined to the ulnar side, the normal inclination is 20 ° ~ 25 °, after the fracture can be reduced to 5 ° ~ 15 ° or even disappear; on the lateral position, the distal end of the humerus is displaced to the dorsal side, the ulnar angle of the articular surface Reduced or disappeared, normal is 10 ° ~ 15 °.

Differential diagnosis

Differential diagnosis of the stab-shaped deformity of the wrist gun:

The distal end of the silver forked deformity fracture is displaced to the dorsal side with the hand, and there is a depression on the proximal side.

The distal end of the spur-like deformity fracture is displaced to the temporal side with the hand, and the axis of the middle finger is not in the same plane as the axis of the tibia.

X-ray photography, the humerus is transversely cut at about 3.0cm from the articular surface, and the distal segment of the anterior segment is displaced to the temporal side, which can be inserted into the proximal segment and the distance between the lower ankle joint is increased (separated). The lower end of the humerus is inclined to the ulnar side, the normal inclination is 20 ° ~ 25 °, after the fracture can be reduced to 5 ° ~ 15 ° or even disappear; on the lateral position, the distal end of the humerus is displaced to the dorsal side, the ulnar angle of the articular surface Reduced or disappeared, normal is 10 ° ~ 15 °.

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