The correct answer to this question is the shoulder. The shoulder is one of the most complex joints of the body. It is also complex. The joint of the shoulder is where the humerus fits into the scapula. They fit together like a ball and socket. The shoulder also has other bones, including the clavicle, coracoid, and the acromion.
Like all parts of the body, the shoulder can be impacted by many conditions. One is the frozen shoulder, where inflammation develops and causes pain and stiffness. Another condition of the shoulder is gout, which also causes inflammation and pain. There is also osteoarthritis, which is wear and tear that comes with age.