Assertion: shoulder's socket | /r/HasProperty | replaced by a plastic piece
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: In a standard shoulder replacement, the ball portion of the shoulder (the humeral head) is replaced by a metal ball and the socket is replaced by a plastic piece (Figure 2).
text: The socket sometimes is replaced with a plastic piece which is usually fixed to a groove in the socket with cement.