What is an anterior shoulder dislocation?

In an anterior dislocation, the arm is an abducted and externally rotated position. In the externally rotated position, the posterosuperior aspect of the humeral head abuts and drives through the anteroinferior aspect of the glenoid rim. This can damage the humeral head, glenoid labrum, or both.

What are the 3 types of shoulder dislocation?

There are 3 different types of shoulder dislocation:

  • Anterior (forward). The head of the arm bone (humerus) is moved forward, in front of the socket (glenoid).
  • Posterior (behind). The head of the arm bone is moved behind and above the socket.
  • Inferior (bottom).

Are most shoulder dislocations anterior or posterior?

Anterior dislocation is most common, accounting for 95 to 97 percent of cases. Posterior dislocation accounts for 2 to 4 percent, and inferior dislocation (ie, luxatio erecta, which means “to place upward”) accounts for 0.5 percent [6].

Why are anterior shoulder dislocations more common than posterior?

Anterior Shoulder Dislocation An anterior dislocation accounts for 97% of recurrent or first time dislocations. It is the most common dislocation and is caused by the arm being positioned in an excessive amount of abduction and external rotation.

What is a posterior dislocation?

Posterior dislocations also known as Reverse Hill-Sachs lesion are those in which the humeral head has moved backward toward the shoulder blade and they attribute to 4% of all shoulder dislocations.

What is the most common type of anterior shoulder dislocation?

Anterior dislocations can be further divided according to where the humeral head comes to lie: subcoracoid: most common.

What is posterior shoulder dislocation?

Posterior shoulder instability, also known as posterior glenohumeral instability, is a condition in which the head of the humerus (upper arm bone) dislocates or subluxes posteriorly from the glenoid (socket portion of the shoulder) as a result of significant trauma.

Which type of shoulder dislocation is most common?

The shoulder joint is the most frequently dislocated joint of the body. Because it moves in several directions, your shoulder can dislocate forward, backward or downward. The most common variety is a forward (anterior) dislocation.

What type of shoulder dislocation is most common?

Why anterior shoulder dislocation is common?

Anterior shoulder dislocations usually result from abduction, extension, and external rotation, such as when preparing for a volleyball spike. Falls on an outstretched hand are a common cause in older adults.

What is posterior dislocation of shoulder?

What happens in a posterior shoulder dislocation?

Posterior shoulder dislocations usually result from forceful contractions of the internal rotators that occur during seizures and electrical shock. This mechanism can force the humeral head posteriorly, out of its normal alignment and behind the glenoid. Less commonly, posterior shoulder dislocations follow trauma.