Shoulder Instability

Definition

Shoulder instability occurs when the upper-end of the arm bone, known as the humerus, slides partially or completely out of the shoulder socket.The disorder is classified by how much the humerus moves and the direction of the movement:
  • Subluxation—The humeral head moves part way out of the shoulder socket.
  • Dislocation—The humeral head moves completely out of the socket.
  • Anterior—The humeral head moves toward the front.
  • Posterior—The humeral head moves toward the back.
  • Multidirectional
Shoulder Instability
factsheet image
Copyright © Nucleus Medical Media, Inc.

Causes

Shoulder instability often results from injury.

Risk Factors

Factors that may increase your chance of shoulder instability include:
  • Previous shoulder dislocation
  • Athletic activity, especially:
    • Baseball—pitching
    • Football—tackling
    • Tennis
    • Gymnastics
    • Weight-lifting
    • Any collision or contact sport
    • Volleyball
    • Swimming, especially backstroke or butterfly
  • Congenital collagen disorders, such as:
  • Family members with shoulder instability

Symptoms

Symptoms may come on suddenly or develop over time. Shoulder instability may cause:
  • Pain in the shoulder area
  • Shoulder or arm weakness
  • Shoulder may feel loose
  • Shoulder may slip out of place
  • Numb feeling down the arm

leave comments
0
Did you like this? Share with your family and friends.
Related Topics:
Current Research From Top Journals


Chewing Gum After Surgery May Improve Digestive Tract Recovery
April 2015

A systematic review found that participants given chewing gum after abdominal surgery may have a faster return to normal for their digestive system. Unfortunately, the quality of trials is low and more research will need to be done before this simple solution is confirmed.

dot separator
previous editions

Early Peanut Consumption Associated with Lower Risk of Peanut Allergy in High Risk Children
March 2015

Breastfeeding May Decrease the Risk of Childhood Obesity
February 2015

Tonsillectomy May Reduce Number of Sore Throat Days in Children
February 2015

dashed separator

Advertisement

Our Free Newsletter
click here to see all of our uplifting newsletters »

 

Advertisement

Advertisement

DiggDeliciousNewsvineRedditStumbleTechnoratiFacebook