Medically reviewed by Stuart Hershman, MDFact checked by Maddy SimpsonThe shoulder joint is the articulation between the thorax and the arm. This joint is one of the most complex and mobile joints of ...

Dislocation—complete loss of contact between joint surfaces that requires a reduction manoeuvre to restore normal anatomy. This may be acute (first ... partial loss of contact between joint surfaces ...

Ball and socket joints also allow flexion and extension. Flexion of the shoulder joint occurs when the humerus (upper arm) moves forwards from the rest of the body, which happens at the end of an ...