A shoulder subluxation refers to a partial dislocation of the shoulder joint. A shoulder subluxation occurs when the ball of the upper arm bone, called the humerus, partly comes out of the glenoid ...

Subluxation is another word for partial dislocation of a bone. Patellar subluxation is a partial dislocation of the kneecap (patella). It’s also known as patellar instability or kneecap instability.