Assertion: arthritis's joint | /r/HasSubevent | the rubbing of bones
Facets:
value: against each other
type: TRANSITIVE-OBJECT
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.