Assertion: osteoarthritis | /r/CapableOf | form joint
Facets:
value: to break down
type: PURPOSE
Source sentences:
text: Osteoarthritis causes cartilage, the hard, slippery tissue that covers the ends of bones where they form a joint, to break down.
text: Osteoarthritis causes cartilage — the hard, slippery tissue that covers the ends of bones where they form a joint — to break down.