Shoulder instability occurs when your shoulder joint (ball and socket) has lost is normal alignment (ball resting symmetrically in the socket), which causes your arm to lose its support. The most ...

A dislocated shoulder occurs when the top part of the upper arm bone partially or fully comes out of the socket. A dislocated shoulder is painful and results in temporary loss of mobility and function ...

Additional information from Red Velvet about why she was out of action. In addition to her shoulder injury, she also had neck issues.

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