Assertion: osteoarthritis | /r/CreatedBy | gradual wearing
Facets:
value: in a joint
type: LOCATION
value: according to the arthritis foundation
type: OTHER
Source sentences:
text: It's called that because osteoarthritis is caused by the gradual wearing down of cartilage in a joint, which can lead to inflammation of the joint lining and the rubbing of bones against each other, according to the Arthritis Foundation.