What does Perilunate mean?

What does Perilunate mean?

When dislocation occurs in the wrist, it is typically perilunate, meaning that the bones surrounding the lunate lose their continuity with the lunate through disruption of the ligaments. Usually this involves the capitate dislocating dorsally.

What is Perilunate subluxation?

A perilunate dislocation can be described as… dislocation of the capitate from the lunate, and subluxation of the lunate from the radius. dorsal dislocation of the capitate and carpus relative to the anatomically aligned lunate. dorsal dislocation of the lunate, no longer articulating with the capitate or radius.

Where is the Perilunate?

Perilunate injuries of the wrist describes the radius-to-ulnar disruption injuries through the scaphoid and capitate bones and ligaments at some distance from the lunate (see the images below).

How can I reduce Perilunation?

The reduction maneuver involves placing longitudinal traction on the wrist with the elbow flexed at 90°. A thumb is placed on the volar aspect of the lunate to prevent a volar dislocation of the lunate. The wrist is extended and then flexed while maintaining traction.

How is Perilunate dislocation treated?

The treatment choices for perilunate and lunate dislocations are closed reduction and casting, open reduction-internal fixation-ligament repair, trapeziolunate external fixation, limited wrist arthrodesis and proximal row carpectomy.

What causes SLAC wrist?

CAUSES. Most cases of SLAC wrist start with a significant wrist sprain or fracture, but occasionally no history of injury is recalled. Some cases of scapholunate ligament injury may be due to repetitive heavy loading of the wrist as seen with obesity, or inflammatory conditions of the wrist that damage the ligament.

What is a Perilunate subluxation?

How do you tell if your lunate is dislocated?

Signs of a Perilunate Injury

1. Significant pain in the wrist and palm of hand.
2. Swelling of the hand.
3. Limited motion of the wrist and hand.
4. Tingling and numbness of the fingers.

How do you test for lunate dislocation?

If the knuckle of the third metacarpal head is level with the knuckles of the second and fourth metacarpal heads, the sign is positive and indicative of a lunate dislocation. The patient should rest the involved forearm on the table. Then, ask the patient to extend the thumb so that these tendons become prominent.

What does a lunate fracture feel like?

Lunate fractures most often result from a dorsiflexion injury or the impact of the heel of the hand with a hard surface. Patients usually present with weakness of the wrist and pain, which is aggravated with compression along the third digital ray.

What does a broken lunate feel like?

Lunate fractures will present with weakness in the wrist and pain reproduced by palpating the third metacarpal bone. Hammate fractures will present with immediate pain over the area of the thumb at the moment of injury. The pain worsens with any type of gripping activity.

Is lunate dislocation painful?

In perilunate and lunate dislocations, patients present with generalized pain and swelling to the wrist. Pain is typically worsened with wrist range of motion. Unlike many other joint dislocations, gross deformity is not typically present in carpal dislocations.

What is the difference between lunate and perilunate dislocation?

Perilunate dislocation. These injuries involve dislocation of the carpus relative to the lunate which remains in normal alignment with the distal radius . They should not be confused with lunate dislocations where the lunate is dislocated in a volar direction and no longer has normal radiolunate articulation.

What’s the difference between lunate and carpal dislocation?

They should not be confused with lunate dislocations where the lunate is dislocated in a volar direction and no longer has normal radiolunate articulation. Overall, carpal dislocations account for less than 10% of all wrist injuries.

What happens to the carpal bones in a perilunate dislocation?

In a trans-scaphoid perilunate dislocation the proximal scaphoid maintains its lunate relationship, and the distal scaphoid and remainder of the carpal bones displace dorsally 3.

What causes fusion of the radiolunate carpal joint?

Some readily recognized fusions also occur as a congenital carpal coalition, and certain acquired partial carpal fusions occur as a consequence of disease. For example, in rheumatoid arthritis, spontaneous fusion of the radiolunate joint may occur, which prevents subluxation of the carpus.