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Dislocations of Bones of the Hand

(Wrist Dislocation; Perilunate Dislocation; Lunate Dislocation)

By

Danielle Campagne

, MD, University of California, San Francisco

Last full review/revision Jan 2021| Content last modified Jan 2021
CLICK HERE FOR THE PROFESSONAL VERSION
Topic Resources

The bones at the base the hand (carpal bones), usually the lunate or the capitate, move out of their normal position.

  • These dislocations usually occur when great force is applied to the wrist and it is bent backward.

  • The wrist and hand are painful and may look misshapen, and people cannot move them normally.

  • Symptoms and the circumstances of the injury suggest the diagnosis, but doctors take x-rays to confirm it.

  • Doctors manipulate the bones back in place without making an incision, apply a splint, and refer people to an orthopedist because surgery is often needed.

The carpal (wrist) bones are located at the base of the hand, between the forearm bones (radius and ulna) and the long metacarpal bones of the hand. There are eight small carpal bones.

Two of the carpal bones are commonly dislocated:

  • The capitate (which is the largest bone in the hand, located in the middle of the lower palm)

  • The lunate (which is located between the capitate and the end of the ulna)

Dislocation of the capitate is called a perilunate dislocation. Perilunate dislocations are more common than lunate dislocations.

These dislocations result from great force that causes the wrist to bend backward, usually a fall on an outstretched hand or an injury in a car crash.

Bones in the Wrist

Bones in the Wrist

Symptoms

When one of the carpal bones is dislocated, the wrist and palm of the hand are painful. People cannot move the wrist and hand normally. The wrist usually looks misshapen, and the hand swells.

The fingers may tingle and feel numb because the dislocated bone puts pressure on the carpal tunnel (a narrow passageway of fibrous tissue) and the nerves and blood vessels it contains (causing carpal tunnel syndrome Carpal Tunnel Syndrome Carpal tunnel syndrome is a painful compression (pinching) of the median nerve as it passes through the carpal tunnel in the wrist. The cause of most cases of carpal tunnel syndrome is unknown... read more Carpal Tunnel Syndrome ). The blood supply to bones in the wrist may be reduced or disrupted, and bone tissue may die. Over time, the wrist joint may deteriorate, causing disabling arthritis.

Diagnosis

  • X-rays

Prompt diagnosis and treatment of wrist dislocations can help reduce the risk of complications, such as arthritis and death of bone tissue.

People should go to an emergency department if they think that they have dislocated these bones.

People can wait up to a day before deciding whether to call the doctor if the wrist looks and moves normally and if pain can be controlled with over-the-counter drugs. However, if symptoms last more than a day, they should see a doctor.

Treatment

  • Manipulation to put the bones back in place

  • A splint

  • Referral to an orthopedist

  • Usually surgical repair

In people with a wrist dislocation, doctors manipulate the wrist bones back in place, without making an incision (called closed reduction). Then a splint is applied to immobilize the wrist and elbow. Usually doctors also immediately refer people to an orthopedist.

Most perilunate and lunate dislocations must be surgically repaired because people have better use of the hand after surgical repair.

Recovery typically takes months.

NOTE: This is the Consumer Version. DOCTORS: CLICK HERE FOR THE PROFESSONAL VERSION
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