Assertion: primary osteoarthritis | /r/HasProperty | differentiated by its lack of marginal erosions
Facets:
value: from rheumatoid arthritis
type: OTHER
Source sentences:
text: Primary osteoarthritis can be differentiated from rheumatoid arthritis by its lack of marginal erosions, and uniformity in joint space narrowing at the small hand joints; furthermore, RA rarely involves the DIP joints.