Shoulder instability exists on a continuum, and on the extreme end is complete dislocation, or when the ball of the joint becomes so loose it actually comes out of the socket. It's also possible to partially dislocate your shoulder, called subluxation, which occurs when the shoulder almost slips completely out of the socket, but then pops back in. With subluxation, people often notice that their shoulder feels loose and slips in certain positions—often when their arm is raised over their head. Both subluxation and dislocation can also result from trauma, such as a fall or blow that occurs with enough force to overpower the strength of the muscles and ligaments of the shoulder.
The upshot? Steroid injections are bad news. We have more than enough data now that these medications in their usual doses should never be injected into joints or tendons. If they have to be used for some reason, patients should be counseled that they are receiving a toxic substance and that it’s use will likely damage their tissues. Given the amount of research on the topic of toxic anesthetics and steroids and a warning from the major Orthopedics Association (AAOS), have these shots tipped the scale from standard of care to medical malpractice?